Get the type of a variable in MySQL?

You cannot get the type of variable in MySQL. Cast the type of variable into another using CAST operator. The syntax is as follows −

SET @yourVariableName:=’anyValue’

Use the CAST operator to cast to another type. The syntax is as follows −

SELECT CAST( @yourVariableName AS SIGNED);

To understand the above syntax, let us cast to another type.

Case 1: String to unsigned −

mysql> set @StringToInt:='12345';
Query OK, 0 rows affected (0.00 sec)

The query is as follows to another type −

mysql> select CAST(@StringToInt as UNSIGNED);

The following is the output −

+--------------------------------+
| CAST(@StringToInt as UNSIGNED) |
+--------------------------------+
| 12345                          |
+--------------------------------+
1 row in set (0.00 sec)

Case 2: Int to char

The query is as follows −

mysql> set @IntTochar:=CAST(65 as CHAR);
Query OK, 0 rows affected (0.00 sec)

The query is as follows −

mysql> select @IntTochar;

The following is the output −

+------------+
| @IntTochar |
+------------+
| 65         |
+------------+
1 row in set (0.00 sec)