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SQLServer in ISNULL and NULLIF how to use, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

ISNULL in SQL Server is different from IsNull in ASP. SQL Server has two parameters, syntax: ISNULL (check_expression, replacement_value).

Check_expression and replacement_value data types must be the same if check_expression is NULL, return replacement_value if check_expression is not NULL, return check_expression

NULLIF is used to check two expressions. Syntax: NULLIF (expression, expression) returns NULL if two expression are equal. This NULL is the data type of the first expression. If the two expression are not equal, the first expressio is returned.

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