GREATEST(value1,value2,...) returns NULL if any argument is NULL. : GREATEST « Comparison Functions Operators « MySQL Tutorial

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MySQL Tutorial » Comparison Functions Operators » GREATEST

15.6.2.GREATEST(value1,value2,...) returns NULL if any argument is NULL.

mysql>

mysql> SELECT GREATEST(2,NULL);

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

| GREATEST(2,NULL) |

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

|             NULL |

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

1 row in set (0.00 sec)



mysql>

15.6.GREATEST
	15.6.1.	GREATEST(value1,value2,...) returns the largest (maximum-valued) argument within two or more arguments
	15.6.2.	GREATEST(value1,value2,...) returns NULL if any argument is NULL.
	15.6.3.	SELECT GREATEST(3.0,3.0,5.0,7.0);
	15.6.4.	SELECT GREATEST('B','A','C');
	15.6.5.	Use GREATEST(value1,value2,...) function with column data
	15.6.6.	GREATEST(@id1, @id2, @id3, @id4, @id5): using Greatest function with user-defined variables

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