IF
If expr1 is TRUE, IF() returns expr2. Otherwise, it returns expr3.
Syntax​
IF(expr1,expr2,expr3)
Arguments​
| Arguments | Description |
|---|---|
| expr1 | The condition for evaluation that can be true or false. |
| expr2 | The expression to return if condition is met. |
| expr3 | The expression to return if condition is not met. |
Return Type​
The return type is determined by expr2 and expr3, they must have the lowest common type.
Examples​
mysql> select if(number=0, true, false) from numbers(1);
+-------------------------------+
| if((number = 0), true, false) |
+-------------------------------+
| 1 |
+-------------------------------+
1 row in set (0.01 sec)
mysql> SELECT if(number > 5, number*5, number+5 ) FROM numbers(10);
+----------------------------------------------+
| if((number > 5), (number * 5), (number + 5)) |
+----------------------------------------------+
| 5 |
| 6 |
| 7 |
| 8 |
| 9 |
| 10 |
| 30 |
| 35 |
| 40 |
| 45 |
+----------------------------------------------+