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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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26 sie 2021 · I need the data for months 5 to 8 and data where Date1 is NULL Query: select Date1, name from t1 where (month(Date1) <= 8 and month(Date1)>=5) or (month(Date1)=null)
This tutorial introduces you to the SQL NULLIF function and shows you how to add the if-else condition to your SQL queries.
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.
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.
8 maj 2022 · SQL NULLIF () Explained. Most major RDBMS s support the NULLIF() operator, which returns NULL if both of its arguments are equivalent. If the arguments not equivalent, NULLIF() returns the first argument. NULLIF() is a SQL-standard feature (it’s included in the ISO/IEC 9075 specification).
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)
