diff --git a/ibis/backends/sql/compilers/base.py b/ibis/backends/sql/compilers/base.py
index 190f9e533879..921a568d3041 100644
--- a/ibis/backends/sql/compilers/base.py
+++ b/ibis/backends/sql/compilers/base.py
@@ -293,7 +293,7 @@ class SQLGlotCompiler(abc.ABC):
     LOWERED_OPS: dict[type[ops.Node], pats.Replace | None] = {
         ops.Bucket: lower_bucket,
         ops.Capitalize: lower_capitalize,
-        ops.Sample: lower_sample(supports_methods=()),
+        ops.Sample: lower_sample(supported_methods=()),
         ops.StringSlice: lower_stringslice,
     }
     """A mapping from an operation class to either a rewrite rule for rewriting that
diff --git a/ibis/backends/sql/compilers/bigquery/__init__.py b/ibis/backends/sql/compilers/bigquery/__init__.py
index 0e8f3a7d3017..19cd463ab1a2 100644
--- a/ibis/backends/sql/compilers/bigquery/__init__.py
+++ b/ibis/backends/sql/compilers/bigquery/__init__.py
@@ -22,6 +22,7 @@
     exclude_unsupported_window_frame_from_ops,
     exclude_unsupported_window_frame_from_rank,
     exclude_unsupported_window_frame_from_row_number,
+    lower_sample,
     split_select_distinct_with_order_by,
 )
 from ibis.common.temporal import DateUnit, IntervalUnit, TimestampUnit, TimeUnit
@@ -118,6 +119,14 @@ class BigQueryCompiler(SQLGlotCompiler):
 
     supports_qualify = True
 
+    LOWERED_OPS = {
+        ops.Sample: lower_sample(
+            supported_methods=("block",),
+            supports_seed=False,
+            physical_tables_only=True,
+        ),
+    }
+
     UNSUPPORTED_OPS = (
         ops.DateDiff,
         ops.ExtractAuthority,
diff --git a/ibis/backends/sql/compilers/druid.py b/ibis/backends/sql/compilers/druid.py
index 11a5bd536f62..4e2710b39992 100644
--- a/ibis/backends/sql/compilers/druid.py
+++ b/ibis/backends/sql/compilers/druid.py
@@ -65,6 +65,7 @@ class DruidCompiler(SQLGlotCompiler):
         ops.TypeOf,
         ops.Unnest,
         ops.Variance,
+        ops.Sample,
     )
 
     SIMPLE_OPS = {
diff --git a/ibis/backends/sql/compilers/impala.py b/ibis/backends/sql/compilers/impala.py
index a21d89c3872b..06269cc4b0de 100644
--- a/ibis/backends/sql/compilers/impala.py
+++ b/ibis/backends/sql/compilers/impala.py
@@ -10,7 +10,7 @@
 from ibis.backends.sql.compilers.base import NULL, STAR, SQLGlotCompiler
 from ibis.backends.sql.datatypes import ImpalaType
 from ibis.backends.sql.dialects import Impala
-from ibis.backends.sql.rewrites import rewrite_empty_order_by_window
+from ibis.backends.sql.rewrites import lower_sample, rewrite_empty_order_by_window
 
 
 class ImpalaCompiler(SQLGlotCompiler):
@@ -23,6 +23,12 @@ class ImpalaCompiler(SQLGlotCompiler):
         *SQLGlotCompiler.rewrites,
     )
 
+    LOWERED_OPS = {
+        ops.Sample: lower_sample(
+            supported_methods=("block",), physical_tables_only=True
+        ),
+    }
+
     UNSUPPORTED_OPS = (
         ops.ArgMax,
         ops.ArgMin,
diff --git a/ibis/backends/sql/compilers/mssql.py b/ibis/backends/sql/compilers/mssql.py
index dbb0e3f9fe2c..900877c5117a 100644
--- a/ibis/backends/sql/compilers/mssql.py
+++ b/ibis/backends/sql/compilers/mssql.py
@@ -22,6 +22,7 @@
 from ibis.backends.sql.rewrites import (
     exclude_unsupported_window_frame_from_ops,
     exclude_unsupported_window_frame_from_row_number,
+    lower_sample,
     p,
     replace,
     split_select_distinct_with_order_by,
@@ -73,6 +74,12 @@ class MSSQLCompiler(SQLGlotCompiler):
     post_rewrites = (split_select_distinct_with_order_by,)
     copy_func_args = True
 
+    LOWERED_OPS = {
+        ops.Sample: lower_sample(
+            supported_methods=("block",), physical_tables_only=True
+        ),
+    }
+
     UNSUPPORTED_OPS = (
         ops.ApproxMedian,
         ops.ArgMax,
diff --git a/ibis/backends/sql/compilers/oracle.py b/ibis/backends/sql/compilers/oracle.py
index faee258b10e4..737a7515001a 100644
--- a/ibis/backends/sql/compilers/oracle.py
+++ b/ibis/backends/sql/compilers/oracle.py
@@ -16,6 +16,7 @@
     exclude_unsupported_window_frame_from_row_number,
     lower_log2,
     lower_log10,
+    lower_sample,
     rewrite_empty_order_by_window,
 )
 
@@ -46,6 +47,7 @@ class OracleCompiler(SQLGlotCompiler):
     LOWERED_OPS = {
         ops.Log2: lower_log2,
         ops.Log10: lower_log10,
+        ops.Sample: lower_sample(physical_tables_only=True),
     }
 
     UNSUPPORTED_OPS = (
diff --git a/ibis/backends/sql/compilers/postgres.py b/ibis/backends/sql/compilers/postgres.py
index 7197d6fd03df..ec9f4d374066 100644
--- a/ibis/backends/sql/compilers/postgres.py
+++ b/ibis/backends/sql/compilers/postgres.py
@@ -17,7 +17,7 @@
 from ibis.backends.sql.compilers.base import NULL, STAR, AggGen, SQLGlotCompiler
 from ibis.backends.sql.datatypes import PostgresType
 from ibis.backends.sql.dialects import Postgres
-from ibis.backends.sql.rewrites import split_select_distinct_with_order_by
+from ibis.backends.sql.rewrites import lower_sample, split_select_distinct_with_order_by
 from ibis.common.exceptions import InvalidDecoratorError
 from ibis.util import gen_name
 
@@ -50,6 +50,8 @@ class PostgresCompiler(SQLGlotCompiler):
     POS_INF = sge.Literal.number("'Inf'::double precision")
     NEG_INF = sge.Literal.number("'-Inf'::double precision")
 
+    LOWERED_OPS = {ops.Sample: lower_sample(physical_tables_only=True)}
+
     UNSUPPORTED_OPS = (
         ops.RowID,
         ops.TimeDelta,
diff --git a/ibis/backends/sql/compilers/risingwave.py b/ibis/backends/sql/compilers/risingwave.py
index 73f013eeb96a..c4baf94d6723 100644
--- a/ibis/backends/sql/compilers/risingwave.py
+++ b/ibis/backends/sql/compilers/risingwave.py
@@ -26,6 +26,7 @@ class RisingWaveCompiler(PostgresCompiler):
         ops.RandomUUID,
         ops.MultiQuantile,
         ops.ApproxMultiQuantile,
+        ops.Sample,
         *(
             op
             for op in ALL_OPERATIONS
diff --git a/ibis/backends/sql/dialects.py b/ibis/backends/sql/dialects.py
index f7a2eb38dca9..8f62c3c57f59 100644
--- a/ibis/backends/sql/dialects.py
+++ b/ibis/backends/sql/dialects.py
@@ -307,11 +307,22 @@ class Tokenizer(Hive.Tokenizer):
         STRING_ESCAPES = ["'"]
 
 
+def tablesample_percent_to_int(self, expr):
+    """Impala's TABLESAMPLE only supports integer percentages."""
+    expr = expr.copy()
+    expr.args["percent"] = sge.convert(round(float(expr.args["percent"].this)))
+    return self.tablesample_sql(expr)
+
+
 class Impala(Hive):
     NULL_ORDERING = "nulls_are_large"
     REGEXP_EXTRACT_DEFAULT_GROUP = 0
+    TABLESAMPLE_SIZE_IS_PERCENT = True
+    ALIAS_POST_TABLESAMPLE = False
 
     class Generator(Hive.Generator):
+        TABLESAMPLE_WITH_METHOD = True
+
         TRANSFORMS = Hive.Generator.TRANSFORMS.copy() | {
             sge.ApproxDistinct: rename_func("ndv"),
             sge.IsNan: rename_func("is_nan"),
@@ -319,6 +330,7 @@ class Generator(Hive.Generator):
             sge.DayOfWeek: rename_func("dayofweek"),
             sge.Interval: lambda self, e: _interval(self, e, quote_arg=False),
             sge.CurrentDate: rename_func("current_date"),
+            sge.TableSample: tablesample_percent_to_int,
         }
 
 
diff --git a/ibis/backends/sql/rewrites.py b/ibis/backends/sql/rewrites.py
index 2f455893d528..ae4a6d80961c 100644
--- a/ibis/backends/sql/rewrites.py
+++ b/ibis/backends/sql/rewrites.py
@@ -593,7 +593,7 @@ def lower_capitalize(_, **kwargs):
 
 
 def lower_sample(
-    supports_methods=("row", "block"),
+    supported_methods=("row", "block"),
     supports_seed=True,
     physical_tables_only=False,
 ):
@@ -605,7 +605,7 @@ def lower_sample(
 
     Parameters
     ----------
-    supports_methods
+    supported_methods
         The sampling methods supported by the backend's native TABLESAMPLE operation.
     supports_seed
         Whether the backend's native TABLESAMPLE supports setting a `seed`.
@@ -616,7 +616,7 @@ def lower_sample(
     @replace(p.Sample)
     def lower(_, **kwargs):
         if (
-            (_.method not in supports_methods)
+            _.method not in supported_methods
             or (_.seed is not None and not supports_seed)
             or (
                 physical_tables_only
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/bigquery-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/bigquery-subquery/block.sql
new file mode 100644
index 000000000000..0f6cc00d35ee
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/bigquery-subquery/block.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM `test` AS `t0` TABLESAMPLE system (50.0 PERCENT)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/bigquery-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/bigquery-subquery/row.sql
new file mode 100644
index 000000000000..41fafb2da62d
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/bigquery-subquery/row.sql
@@ -0,0 +1,5 @@
+SELECT
+  *
+FROM `test` AS `t0`
+WHERE
+  RAND() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/bigquery-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/bigquery-table/block.sql
new file mode 100644
index 000000000000..0e8e7838e323
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/bigquery-table/block.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM `test` AS `t0`
+  WHERE
+    `t0`.`x` > 10
+) AS `t1`
+WHERE
+  RAND() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/bigquery-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/bigquery-table/row.sql
new file mode 100644
index 000000000000..0e8e7838e323
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/bigquery-table/row.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM `test` AS `t0`
+  WHERE
+    `t0`.`x` > 10
+) AS `t1`
+WHERE
+  RAND() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/clickhouse-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/clickhouse-subquery/block.sql
new file mode 100644
index 000000000000..93ab234de3b5
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/clickhouse-subquery/block.sql
@@ -0,0 +1,5 @@
+SELECT
+  *
+FROM "test" AS "t0"
+WHERE
+  randCanonical() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/clickhouse-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/clickhouse-subquery/row.sql
new file mode 100644
index 000000000000..93ab234de3b5
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/clickhouse-subquery/row.sql
@@ -0,0 +1,5 @@
+SELECT
+  *
+FROM "test" AS "t0"
+WHERE
+  randCanonical() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/clickhouse-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/clickhouse-table/block.sql
new file mode 100644
index 000000000000..7f4590759a56
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/clickhouse-table/block.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1"
+WHERE
+  randCanonical() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/clickhouse-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/clickhouse-table/row.sql
new file mode 100644
index 000000000000..7f4590759a56
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/clickhouse-table/row.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1"
+WHERE
+  randCanonical() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/datafusion-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/datafusion-subquery/block.sql
new file mode 100644
index 000000000000..f885113afef8
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/datafusion-subquery/block.sql
@@ -0,0 +1,5 @@
+SELECT
+  *
+FROM "test" AS "t0"
+WHERE
+  RANDOM() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/datafusion-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/datafusion-subquery/row.sql
new file mode 100644
index 000000000000..f885113afef8
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/datafusion-subquery/row.sql
@@ -0,0 +1,5 @@
+SELECT
+  *
+FROM "test" AS "t0"
+WHERE
+  RANDOM() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/datafusion-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/datafusion-table/block.sql
new file mode 100644
index 000000000000..0307d641ffea
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/datafusion-table/block.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1"
+WHERE
+  RANDOM() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/datafusion-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/datafusion-table/row.sql
new file mode 100644
index 000000000000..0307d641ffea
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/datafusion-table/row.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1"
+WHERE
+  RANDOM() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/duckdb-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/duckdb-subquery/block.sql
new file mode 100644
index 000000000000..95f441e59611
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/duckdb-subquery/block.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM "test" AS "t0" TABLESAMPLE system (50.0 PERCENT)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/duckdb-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/duckdb-subquery/row.sql
new file mode 100644
index 000000000000..e22aab901495
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/duckdb-subquery/row.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM "test" AS "t0" TABLESAMPLE bernoulli (50.0 PERCENT)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/duckdb-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/duckdb-table/block.sql
new file mode 100644
index 000000000000..5b495ba2d0f1
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/duckdb-table/block.sql
@@ -0,0 +1,9 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1" TABLESAMPLE system (50.0 PERCENT)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/duckdb-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/duckdb-table/row.sql
new file mode 100644
index 000000000000..0542a60cfdec
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/duckdb-table/row.sql
@@ -0,0 +1,9 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1" TABLESAMPLE bernoulli (50.0 PERCENT)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/exasol-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/exasol-subquery/block.sql
new file mode 100644
index 000000000000..f885113afef8
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/exasol-subquery/block.sql
@@ -0,0 +1,5 @@
+SELECT
+  *
+FROM "test" AS "t0"
+WHERE
+  RANDOM() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/exasol-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/exasol-subquery/row.sql
new file mode 100644
index 000000000000..f885113afef8
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/exasol-subquery/row.sql
@@ -0,0 +1,5 @@
+SELECT
+  *
+FROM "test" AS "t0"
+WHERE
+  RANDOM() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/exasol-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/exasol-table/block.sql
new file mode 100644
index 000000000000..0307d641ffea
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/exasol-table/block.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1"
+WHERE
+  RANDOM() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/exasol-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/exasol-table/row.sql
new file mode 100644
index 000000000000..0307d641ffea
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/exasol-table/row.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1"
+WHERE
+  RANDOM() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/flink-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/flink-subquery/block.sql
new file mode 100644
index 000000000000..41fafb2da62d
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/flink-subquery/block.sql
@@ -0,0 +1,5 @@
+SELECT
+  *
+FROM `test` AS `t0`
+WHERE
+  RAND() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/flink-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/flink-subquery/row.sql
new file mode 100644
index 000000000000..41fafb2da62d
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/flink-subquery/row.sql
@@ -0,0 +1,5 @@
+SELECT
+  *
+FROM `test` AS `t0`
+WHERE
+  RAND() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/flink-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/flink-table/block.sql
new file mode 100644
index 000000000000..0e8e7838e323
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/flink-table/block.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM `test` AS `t0`
+  WHERE
+    `t0`.`x` > 10
+) AS `t1`
+WHERE
+  RAND() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/flink-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/flink-table/row.sql
new file mode 100644
index 000000000000..0e8e7838e323
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/flink-table/row.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM `test` AS `t0`
+  WHERE
+    `t0`.`x` > 10
+) AS `t1`
+WHERE
+  RAND() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/impala-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/impala-subquery/block.sql
new file mode 100644
index 000000000000..83bd5d40d36d
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/impala-subquery/block.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM `test` AS `t0` TABLESAMPLE system (50)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/impala-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/impala-subquery/row.sql
new file mode 100644
index 000000000000..48e9d653b370
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/impala-subquery/row.sql
@@ -0,0 +1,5 @@
+SELECT
+  *
+FROM `test` AS `t0`
+WHERE
+  RAND(UTC_TO_UNIX_MICROS(UTC_TIMESTAMP())) <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/impala-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/impala-table/block.sql
new file mode 100644
index 000000000000..5b84da7919ec
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/impala-table/block.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM `test` AS `t0`
+  WHERE
+    `t0`.`x` > 10
+) AS `t1`
+WHERE
+  RAND(UTC_TO_UNIX_MICROS(UTC_TIMESTAMP())) <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/impala-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/impala-table/row.sql
new file mode 100644
index 000000000000..5b84da7919ec
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/impala-table/row.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM `test` AS `t0`
+  WHERE
+    `t0`.`x` > 10
+) AS `t1`
+WHERE
+  RAND(UTC_TO_UNIX_MICROS(UTC_TIMESTAMP())) <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/mssql-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/mssql-subquery/block.sql
new file mode 100644
index 000000000000..5427966160cd
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/mssql-subquery/block.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM [test] AS [t0] TABLESAMPLE system (50.0 PERCENT)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/mssql-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/mssql-subquery/row.sql
new file mode 100644
index 000000000000..1624a907034f
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/mssql-subquery/row.sql
@@ -0,0 +1,6 @@
+SELECT
+  [t0].[x],
+  [t0].[y]
+FROM [test] AS [t0]
+WHERE
+  RAND(CHECKSUM(NEWID())) <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/mssql-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/mssql-table/block.sql
new file mode 100644
index 000000000000..a8b9fc180414
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/mssql-table/block.sql
@@ -0,0 +1,13 @@
+SELECT
+  [t1].[x],
+  [t1].[y]
+FROM (
+  SELECT
+    [t0].[x],
+    [t0].[y]
+  FROM [test] AS [t0]
+  WHERE
+    [t0].[x] > 10
+) AS [t1]
+WHERE
+  RAND(CHECKSUM(NEWID())) <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/mssql-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/mssql-table/row.sql
new file mode 100644
index 000000000000..a8b9fc180414
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/mssql-table/row.sql
@@ -0,0 +1,13 @@
+SELECT
+  [t1].[x],
+  [t1].[y]
+FROM (
+  SELECT
+    [t0].[x],
+    [t0].[y]
+  FROM [test] AS [t0]
+  WHERE
+    [t0].[x] > 10
+) AS [t1]
+WHERE
+  RAND(CHECKSUM(NEWID())) <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/mysql-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/mysql-subquery/block.sql
new file mode 100644
index 000000000000..41fafb2da62d
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/mysql-subquery/block.sql
@@ -0,0 +1,5 @@
+SELECT
+  *
+FROM `test` AS `t0`
+WHERE
+  RAND() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/mysql-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/mysql-subquery/row.sql
new file mode 100644
index 000000000000..41fafb2da62d
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/mysql-subquery/row.sql
@@ -0,0 +1,5 @@
+SELECT
+  *
+FROM `test` AS `t0`
+WHERE
+  RAND() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/mysql-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/mysql-table/block.sql
new file mode 100644
index 000000000000..0e8e7838e323
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/mysql-table/block.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM `test` AS `t0`
+  WHERE
+    `t0`.`x` > 10
+) AS `t1`
+WHERE
+  RAND() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/mysql-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/mysql-table/row.sql
new file mode 100644
index 000000000000..0e8e7838e323
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/mysql-table/row.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM `test` AS `t0`
+  WHERE
+    `t0`.`x` > 10
+) AS `t1`
+WHERE
+  RAND() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/oracle-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/oracle-subquery/block.sql
new file mode 100644
index 000000000000..36f81d7681a5
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/oracle-subquery/block.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM "test" SAMPLE system (50.0) "t0"
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/oracle-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/oracle-subquery/row.sql
new file mode 100644
index 000000000000..860e3a680338
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/oracle-subquery/row.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM "test" SAMPLE bernoulli (50.0) "t0"
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/oracle-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/oracle-table/block.sql
new file mode 100644
index 000000000000..7e8543314947
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/oracle-table/block.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" "t0"
+  WHERE
+    "t0"."x" > 10
+) "t1"
+WHERE
+  DBMS_RANDOM.VALUE() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/oracle-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/oracle-table/row.sql
new file mode 100644
index 000000000000..7e8543314947
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/oracle-table/row.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" "t0"
+  WHERE
+    "t0"."x" > 10
+) "t1"
+WHERE
+  DBMS_RANDOM.VALUE() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/postgres-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/postgres-subquery/block.sql
new file mode 100644
index 000000000000..27b5ab3d5046
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/postgres-subquery/block.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM "test" AS "t0" TABLESAMPLE system (50.0)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/postgres-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/postgres-subquery/row.sql
new file mode 100644
index 000000000000..72f6ef978124
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/postgres-subquery/row.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM "test" AS "t0" TABLESAMPLE bernoulli (50.0)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/postgres-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/postgres-table/block.sql
new file mode 100644
index 000000000000..0307d641ffea
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/postgres-table/block.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1"
+WHERE
+  RANDOM() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/postgres-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/postgres-table/row.sql
new file mode 100644
index 000000000000..0307d641ffea
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/postgres-table/row.sql
@@ -0,0 +1,11 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1"
+WHERE
+  RANDOM() <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/pyspark-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/pyspark-subquery/block.sql
new file mode 100644
index 000000000000..c9099652a914
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/pyspark-subquery/block.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM `test` TABLESAMPLE (50.0 PERCENT) AS `t0`
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/pyspark-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/pyspark-subquery/row.sql
new file mode 100644
index 000000000000..c9099652a914
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/pyspark-subquery/row.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM `test` TABLESAMPLE (50.0 PERCENT) AS `t0`
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/pyspark-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/pyspark-table/block.sql
new file mode 100644
index 000000000000..27955a82792f
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/pyspark-table/block.sql
@@ -0,0 +1,9 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM `test` AS `t0`
+  WHERE
+    `t0`.`x` > 10
+) TABLESAMPLE (50.0 PERCENT) AS `t1`
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/pyspark-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/pyspark-table/row.sql
new file mode 100644
index 000000000000..27955a82792f
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/pyspark-table/row.sql
@@ -0,0 +1,9 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM `test` AS `t0`
+  WHERE
+    `t0`.`x` > 10
+) TABLESAMPLE (50.0 PERCENT) AS `t1`
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/snowflake-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/snowflake-subquery/block.sql
new file mode 100644
index 000000000000..27b5ab3d5046
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/snowflake-subquery/block.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM "test" AS "t0" TABLESAMPLE system (50.0)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/snowflake-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/snowflake-subquery/row.sql
new file mode 100644
index 000000000000..72f6ef978124
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/snowflake-subquery/row.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM "test" AS "t0" TABLESAMPLE bernoulli (50.0)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/snowflake-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/snowflake-table/block.sql
new file mode 100644
index 000000000000..2c9987d23ddf
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/snowflake-table/block.sql
@@ -0,0 +1,9 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1" TABLESAMPLE system (50.0)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/snowflake-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/snowflake-table/row.sql
new file mode 100644
index 000000000000..38eb63631277
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/snowflake-table/row.sql
@@ -0,0 +1,9 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1" TABLESAMPLE bernoulli (50.0)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/sqlite-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/sqlite-subquery/block.sql
new file mode 100644
index 000000000000..929dbdeaf464
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/sqlite-subquery/block.sql
@@ -0,0 +1,9 @@
+SELECT
+  *
+FROM "test" AS "t0"
+WHERE
+  (
+    0.5 + (
+      CAST(RANDOM() AS REAL) / -1.8446744073709552e+19
+    )
+  ) <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/sqlite-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/sqlite-subquery/row.sql
new file mode 100644
index 000000000000..929dbdeaf464
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/sqlite-subquery/row.sql
@@ -0,0 +1,9 @@
+SELECT
+  *
+FROM "test" AS "t0"
+WHERE
+  (
+    0.5 + (
+      CAST(RANDOM() AS REAL) / -1.8446744073709552e+19
+    )
+  ) <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/sqlite-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/sqlite-table/block.sql
new file mode 100644
index 000000000000..d7cac89b0e38
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/sqlite-table/block.sql
@@ -0,0 +1,15 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1"
+WHERE
+  (
+    0.5 + (
+      CAST(RANDOM() AS REAL) / -1.8446744073709552e+19
+    )
+  ) <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/sqlite-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/sqlite-table/row.sql
new file mode 100644
index 000000000000..d7cac89b0e38
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/sqlite-table/row.sql
@@ -0,0 +1,15 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1"
+WHERE
+  (
+    0.5 + (
+      CAST(RANDOM() AS REAL) / -1.8446744073709552e+19
+    )
+  ) <= 0.5
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/trino-subquery/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/trino-subquery/block.sql
new file mode 100644
index 000000000000..27b5ab3d5046
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/trino-subquery/block.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM "test" AS "t0" TABLESAMPLE system (50.0)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/trino-subquery/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/trino-subquery/row.sql
new file mode 100644
index 000000000000..72f6ef978124
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/trino-subquery/row.sql
@@ -0,0 +1,3 @@
+SELECT
+  *
+FROM "test" AS "t0" TABLESAMPLE bernoulli (50.0)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/trino-table/block.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/trino-table/block.sql
new file mode 100644
index 000000000000..2c9987d23ddf
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/trino-table/block.sql
@@ -0,0 +1,9 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1" TABLESAMPLE system (50.0)
\ No newline at end of file
diff --git a/ibis/backends/tests/snapshots/test_sql/test_sample/trino-table/row.sql b/ibis/backends/tests/snapshots/test_sql/test_sample/trino-table/row.sql
new file mode 100644
index 000000000000..38eb63631277
--- /dev/null
+++ b/ibis/backends/tests/snapshots/test_sql/test_sample/trino-table/row.sql
@@ -0,0 +1,9 @@
+SELECT
+  *
+FROM (
+  SELECT
+    *
+  FROM "test" AS "t0"
+  WHERE
+    "t0"."x" > 10
+) AS "t1" TABLESAMPLE bernoulli (50.0)
\ No newline at end of file
diff --git a/ibis/backends/tests/test_generic.py b/ibis/backends/tests/test_generic.py
index 472aec7d54c2..714f987d76cb 100644
--- a/ibis/backends/tests/test_generic.py
+++ b/ibis/backends/tests/test_generic.py
@@ -2141,7 +2141,7 @@ def test_dynamic_table_slice_with_computed_offset(backend):
         ),
     ],
 )
-@pytest.mark.parametrize("subquery", [True, False])
+@pytest.mark.parametrize("subquery", [True, False], ids=["subquery", "table"])
 @pytest.mark.xfail_version(pyspark=["sqlglot==25.17.0"])
 def test_sample(backend, method, alltypes, subquery):
     if subquery:
@@ -2175,7 +2175,6 @@ def test_sample_memtable(con, backend):
         "mysql",
         "oracle",
         "polars",
-        "postgres",
         "risingwave",
         "sqlite",
         "trino",
diff --git a/ibis/backends/tests/test_sql.py b/ibis/backends/tests/test_sql.py
index a36ad3da3d6e..9f94744cc29d 100644
--- a/ibis/backends/tests/test_sql.py
+++ b/ibis/backends/tests/test_sql.py
@@ -241,3 +241,21 @@ def test_rewrite_context(snapshot, backend_name):
     expr = table.select(new_col=ibis.ntile(2).over(order_by=ibis.random())).limit(10)
     result = ibis.to_sql(expr, dialect=backend_name)
     snapshot.assert_match(result, "out.sql")
+
+
+@pytest.mark.parametrize("subquery", [False, True], ids=["subquery", "table"])
+@pytest.mark.parametrize("backend_name", _get_backends_to_test())
+@pytest.mark.notimpl(["polars"], raises=ValueError, reason="not a SQL backend")
+@pytest.mark.notimpl(
+    ["druid", "risingwave"],
+    raises=exc.OperationNotDefinedError,
+    reason="sample not supported",
+)
+def test_sample(backend_name, snapshot, subquery):
+    t = ibis.table({"x": "int64", "y": "int64"}, name="test")
+    if subquery:
+        t = t.filter(t.x > 10)
+    block = ibis.to_sql(t.sample(0.5, method="block"), dialect=backend_name)
+    row = ibis.to_sql(t.sample(0.5, method="row"), dialect=backend_name)
+    snapshot.assert_match(block, "block.sql")
+    snapshot.assert_match(row, "row.sql")
diff --git a/ibis/expr/types/relations.py b/ibis/expr/types/relations.py
index 7e58417609ce..00450a44e837 100644
--- a/ibis/expr/types/relations.py
+++ b/ibis/expr/types/relations.py
@@ -1224,12 +1224,13 @@ def sample(
         method
             The sampling method to use. The default is "row", which includes
             each row with a probability of `fraction`. If method is "block",
-            some backends may instead perform sampling a fraction of blocks of
-            rows (where "block" is a backend dependent definition). This is
-            identical to "row" for backends lacking a blockwise sampling
-            implementation. For those coming from SQL, "row" and "block"
-            correspond to "bernoulli" and "system" respectively in a
-            TABLESAMPLE clause.
+            some backends may instead sample a fraction of blocks of rows
+            (where "block" is a backend dependent definition), which may be
+            significantly more efficient (at the cost of a less statistically
+            random sample). This is identical to "row" for backends lacking a
+            blockwise sampling implementation. For those coming from SQL, "row"
+            and "block" correspond to "bernoulli" and "system" respectively in
+            a TABLESAMPLE clause.
         seed
             An optional random seed to use, for repeatable sampling. The range
             of possible seed values is backend specific (most support at least