NULLIF() compares two expressions. If they are equal, it returns NULL. Otherwise, it returns the first expression. : NULLIF « Conversion Functions « Oracle PL / SQL

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Oracle PL / SQL » Conversion Functions » NULLIF

NULLIF() compares two expressions. If they are equal, it returns NULL. Otherwise, it returns the first expression.


 

SQL>

Syntax: NULLIF( <expression1>,<expression2>)

SQL>

SQL> SELECT

  2     NULLIF('ABC','ABC')  equal,

  3     NULLIF ('ABC','DEF') diff from dual;



EQU DIF

--- ---

    ABC

Related examples in the same category

1.	select nullif( 1, 1 )
2.	select nullif( 1, null )

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