IFNULL() with NULL and NOT NULL value : IFNULL « Control Flow Functions « MySQL Tutorial

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MySQL Tutorial » Control Flow Functions » IFNULL

18. 4. 5. IFNULL() with NULL and NOT NULL value


mysql>

mysql> SELECT IFNULL(NULL,'The value is Null');

+----------------------------------+

| IFNULL(NULL,'The value is Null') |

+----------------------------------+

| The value is Null                |

+----------------------------------+

1 row in set (0.00 sec)



mysql>

mysql> SELECT IFNULL(10,'The value is Null');

+--------------------------------+

| IFNULL(10,'The value is Null') |

+--------------------------------+

| 10                             |

+--------------------------------+

1 row in set (0.00 sec)



mysql>

18. 4. IFNULL
	18. 4. 1.	IFNULL(expr1,expr2)
	18. 4. 2.	Using IFNULL in where clause
	18. 4. 3.	Using IFNULL with data in a table
	18. 4. 4.	Create a table based on the result of IFNULL
	18. 4. 5.	IFNULL() with NULL and NOT NULL value
	18. 4. 6.	Use the IFNULL() function to specify a zero in place of the NULL figure

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