diff --git a/packages/sql/src/operators.js b/packages/sql/src/operators.js
index 55f24c04..dda6d9b7 100644
--- a/packages/sql/src/operators.js
+++ b/packages/sql/src/operators.js
@@ -9,7 +9,12 @@ function visit(callback) {
 function logical(op, clauses) {
   const children = clauses.filter(x => x != null).map(asColumn);
   const strings = children.map((c, i) => i ? ` ${op} ` : '');
-  if (clauses.length) strings.push('');
+  if (children.length === 1) {
+    strings.push('')
+  } else if (children.length > 1) {
+    strings[0] = '(';
+    strings.push(')');
+  }
   return sql(strings, ...children).annotate({ op, children, visit });
 }
 
diff --git a/packages/sql/test/operator-test.js b/packages/sql/test/operator-test.js
index 2cd32ea1..ea8dd97c 100644
--- a/packages/sql/test/operator-test.js
+++ b/packages/sql/test/operator-test.js
@@ -12,7 +12,8 @@ describe('Logical operators', () => {
     assert.strictEqual(String(and()), '');
     assert.strictEqual(String(and('foo')), '"foo"');
     assert.strictEqual(String(and(null, true)), 'TRUE');
-    assert.strictEqual(String(and(true, true)), 'TRUE AND TRUE');
+    assert.strictEqual(String(and(true, true)), '(TRUE AND TRUE)');
+    assert.strictEqual(String(and(true, null, false)), '(TRUE AND FALSE)');
     assert.strictEqual(and().op, 'AND');
     assert.strictEqual(and().children.length, 0);
     assert.strictEqual(and('foo').children.length, 1);
@@ -23,7 +24,8 @@ describe('Logical operators', () => {
     assert.strictEqual(String(or()), '');
     assert.strictEqual(String(or('foo')), '"foo"');
     assert.strictEqual(String(or(null, true)), 'TRUE');
-    assert.strictEqual(String(or(false, true)), 'FALSE OR TRUE');
+    assert.strictEqual(String(or(false, true)), '(FALSE OR TRUE)');
+    assert.strictEqual(String(or(false, null, false)), '(FALSE OR FALSE)');
     assert.strictEqual(or().op, 'OR');
     assert.strictEqual(or().children.length, 0);
     assert.strictEqual(or('foo').children.length, 1);