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information-schema-schemata.md

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SCHEMATA
Learn the `SCHEMATA` information_schema table.

SCHEMATA

The SCHEMATA table provides information about databases. The table data is equivalent to the result of the SHOW DATABASES statement.

USE information_schema;
desc SCHEMATA;
+----------------------------+--------------+------+------+---------+-------+
| Field                      | Type         | Null | Key  | Default | Extra |
+----------------------------+--------------+------+------+---------+-------+
| CATALOG_NAME               | varchar(512) | YES  |      | NULL    |       |
| SCHEMA_NAME                | varchar(64)  | YES  |      | NULL    |       |
| DEFAULT_CHARACTER_SET_NAME | varchar(64)  | YES  |      | NULL    |       |
| DEFAULT_COLLATION_NAME     | varchar(32)  | YES  |      | NULL    |       |
| SQL_PATH                   | varchar(512) | YES  |      | NULL    |       |
+----------------------------+--------------+------+------+---------+-------+
5 rows in set (0.00 sec)

SELECT * FROM SCHEMATA;
+--------------+--------------------+----------------------------+------------------------+----------+
| CATALOG_NAME | SCHEMA_NAME        | DEFAULT_CHARACTER_SET_NAME | DEFAULT_COLLATION_NAME | SQL_PATH |
+--------------+--------------------+----------------------------+------------------------+----------+
| def          | INFORMATION_SCHEMA | utf8mb4                    | utf8mb4_bin            | NULL     |
| def          | METRICS_SCHEMA     | utf8mb4                    | utf8mb4_bin            | NULL     |
| def          | mysql              | utf8mb4                    | utf8mb4_bin            | NULL     |
| def          | PERFORMANCE_SCHEMA | utf8mb4                    | utf8mb4_bin            | NULL     |
| def          | test               | utf8mb4                    | utf8mb4_bin            | NULL     |
+--------------+--------------------+----------------------------+------------------------+----------+
5 rows in set (0.00 sec)

Fields in the SCHEMATA table are described as follows:

  • CATALOG_NAME: The catalog to which the database belongs.
  • SCHEMA_NAME: The database name.
  • DEFAULT_CHARACTER_SET_NAME: The default character set of the database.
  • DEFAULT_COLLATION_NAME: The default collation of the database.
  • SQL_PATH: The value of this item is always NULL.