SET

Syntax

SET variable_assignment [, variable_assignment] ...

variable_assignment:
      user_var_name = expr
    | [GLOBAL | SESSION] system_var_name = expr
    | [@@global. | @@session. | @@]system_var_name = expr

One can also set a user variable in any expression with this syntax:

user_var_name:= expr

Description

The SET statement assigns values to different types of variables that affect the operation of the server or your client. Older versions of MySQL employed SET OPTION, but this syntax was deprecated in favor of SET without OPTION, and was removed in MariaDB 10.0.

For setting variables on a per-query basis (from MariaDB 10.1.2), see SET STATEMENT.

See SHOW VARIABLES for documentation on viewing server system variables.

See Server System Variables for a list of all the system variables.

Examples

SHOW VARIABLES WHERE Variable_name LIKE "aria_group_commit%";
+----------------------------+-------+
| Variable_name              | Value |
+----------------------------+-------+
| aria_group_commit          | none  |
| aria_group_commit_interval | 0     |
+----------------------------+-------+

SET GLOBAL aria_group_commit="HARD";

SET GLOBAL aria_group_commit_interval=100;

SHOW VARIABLES WHERE Variable_name LIKE "aria_group_commit%";
+----------------------------+-------+
| Variable_name              | Value |
+----------------------------+-------+
| aria_group_commit          | hard  |
| aria_group_commit_interval | 100   |
+----------------------------+-------+

And using the inplace syntax:

SELECT (@a:=1);
+---------+
| (@a:=1) |
+---------+
|       1 |
+---------+

SELECT @a;
+------+
| @a   |
+------+
|    1 |
+------+

See also

• Using last_value() to return data of used rows
• SET STATEMENT
• SET Variable
• DECLARE Variable