You can also assign a value to a user variable in statements other than SET : User Defined Variables « Select Query « MySQL Tutorial

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MySQL Tutorial » Select Query » User Defined Variables   2. 22. 2. You can also assign a value to a user variable in statements other than SET In this case, the assignment operator must be := and not = because = is treated as a comparison operator in non-SET statements: mysql> mysql> SET @t1=0, @t2=1, @t3=2; Query OK, 0 rows affected (0.00 sec) mysql> mysql> SELECT @t1:=(@t2:=1)+@t3:=4,@t1,@t2,@t3; +----------------------+------+------+------+ | @t1:=(@t2:=1)+@t3:=4 | @t1  | @t2  | @t3  | +----------------------+------+------+------+ |                    5 | 5    | 1    | 4    | +----------------------+------+------+------+ 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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