Hello, I would like to ask you a very urgent question to ask you, what is the use of the nullif function? Thank you, please, for your assistance in this matter.
Description
In SQL Server (Transact-SQL), the NULLIF function compares expression1 and expression2. If expression1 and expression2 are equal, the NULLIF function returns NULL. Otherwise, it returns the first expression which is expression1.
Syntax
The syntax for the NULLIF function in SQL Server (Transact-SQL) is:
NULLIF( expression1, expression2 )