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sql-statement-set-names.md

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SET [NAMES|CHARACTER SET] | TiDB SQL Statement Reference
An overview of the usage of SET [NAMES|CHARACTER SET] for the TiDB database.
/docs/dev/sql-statements/sql-statement-set-names/
/docs/dev/reference/sql/statements/set-names/

SET [NAMES|CHARACTER SET]

The statements SET NAMES, SET CHARACTER SET and SET CHARSET modify the variables character_set_client, character_set_results and character_set_connection for the current connection.

Synopsis

SetNamesStmt ::=
    "SET" ("NAMES" ("DEFAULT" | CharsetName ("COLLATE" ("DEFAULT" | CollationName))?) | ("CHARSET" | ("CHAR" | "CHARACTER") "SET") ("DEFAULT" | CharsetName))

Examples

mysql> SHOW VARIABLES LIKE 'character_set%';
+--------------------------+--------------------------------------------------------+
| Variable_name            | Value                                                  |
+--------------------------+--------------------------------------------------------+
| character_sets_dir       | /usr/local/mysql-5.6.25-osx10.8-x86_64/share/charsets/ |
| character_set_connection | utf8mb4                                                |
| character_set_system     | utf8                                                   |
| character_set_results    | utf8mb4                                                |
| character_set_client     | utf8mb4                                                |
| character_set_database   | utf8mb4                                                |
| character_set_filesystem | binary                                                 |
| character_set_server     | utf8mb4                                                |
+--------------------------+--------------------------------------------------------+
8 rows in set (0.01 sec)

mysql> SET NAMES utf8;
Query OK, 0 rows affected (0.00 sec)

mysql> SHOW VARIABLES LIKE 'character_set%';
+--------------------------+--------------------------------------------------------+
| Variable_name            | Value                                                  |
+--------------------------+--------------------------------------------------------+
| character_sets_dir       | /usr/local/mysql-5.6.25-osx10.8-x86_64/share/charsets/ |
| character_set_connection | utf8                                                   |
| character_set_system     | utf8                                                   |
| character_set_results    | utf8                                                   |
| character_set_client     | utf8                                                   |
| character_set_server     | utf8mb4                                                |
| character_set_database   | utf8mb4                                                |
| character_set_filesystem | binary                                                 |
+--------------------------+--------------------------------------------------------+
8 rows in set (0.00 sec)

mysql> SET CHARACTER SET utf8mb4;
Query OK, 0 rows affected (0.00 sec)

mysql> SHOW VARIABLES LIKE 'character_set%';
+--------------------------+--------------------------------------------------------+
| Variable_name            | Value                                                  |
+--------------------------+--------------------------------------------------------+
| character_set_connection | utf8mb4                                                |
| character_set_system     | utf8                                                   |
| character_set_results    | utf8mb4                                                |
| character_set_client     | utf8mb4                                                |
| character_sets_dir       | /usr/local/mysql-5.6.25-osx10.8-x86_64/share/charsets/ |
| character_set_database   | utf8mb4                                                |
| character_set_filesystem | binary                                                 |
| character_set_server     | utf8mb4                                                |
+--------------------------+--------------------------------------------------------+
8 rows in set (0.00 sec)

MySQL compatibility

The SET [NAMES|CHARACTER SET] statement in TiDB is fully compatible with MySQL. If you find any compatibility differences, report a bug.

See also