User variables are written as @var_name. : User Defined Variables « Select Query « MySQL Tutorial

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MySQL Tutorial » Select Query » User Defined Variables   2. 22. 1. User variables are written as @var_name. The variable name var_name may consist of alphanumeric characters from the current character set, '.','_', and $. One way to set a user-defined variable is by issuing a SET statement: SET @var_name = expr [, @var_name = expr] ... mysql> mysql> SET @t1=0, @t2=1, @t3=2; Query OK, 0 rows affected (0.00 sec) mysql> mysql> select @t1; +------+ | @t1  | +------+ | 0    | +------+ 1 row in set (0.00 sec) mysql> select @t2; +------+ | @t2  | +------+ | 1    | +------+ 1 row in set (0.00 sec) mysql> select @t3; +------+ | @t3  | +------+ | 2    | +------+ 1 row in set (0.00 sec) mysql> 2. 22. User Defined Variables 2. 22. 1.  User variables are written as @var_name. 2. 22. 2.  You can also assign a value to a user variable in statements other than SET 2. 22. 3.  Using User-Defined Variables 2. 22. 4.  Use user-defined variable in the where statement 2. 22. 5.  Create dynamic sql command

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