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Definition and Usage. The NULLIF () function returns NULL if two expressions are equal, otherwise it returns the first expression. Syntax. NULLIF (expr1, expr2) Parameter Values. Technical Details. More Examples. Example. Compare two expressions: SELECT NULLIF('Hello', 'Hello'); Try it Yourself » Example. Compare two expressions:
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9 paź 2008 · I think this is the best way to get the month name when you have the month number. Select DateName( month , DateAdd( month , @MonthNumber , 0 ) - 1 ) Or . Select DateName( month , DateAdd( month , @MonthNumber , -1 ) )
Besides the COALESCE function, SQL provides you with the NULLIF function which is a control flow function that allows you to test the arguments and returns either the first argument or NULL based on the result of the evaluation.
NULLIF returns the first expression if the two expressions are not equal. If the expressions are equal, NULLIF returns a null value of the type of the first expression. Remarks. NULLIF is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL.
The SQL NULLIF function is used to compare two expressions or values and return NULL if they are equal. It provides a way to handle specific cases where you want to treat equality as a special condition by substituting it with a NULL value.
31 paź 2023 · The SQL NULLIF function is a straightforward yet powerful tool to mitigate issues arising from NULL values. The syntax of the NULLIF function is as follows: NULLIF (expression1, expression2) In this syntax, expression1 and expression2 are the arguments of the function.
SQL Server NULLIF expression overview. The NULLIF expression accepts two arguments and returns NULL if two arguments are equal. Otherwise, it returns the first expression. The following shows the syntax of the NULLIF expression: NULLIF(expression1, expression2) Code language: SQL (Structured Query Language) (sql)
