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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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For example, SELECT NULLIF(4,4) AS Same, NULLIF(5,7) AS Different; returns NULL for the first column (4 and 4) because the two input values are the same. The second column returns the first value (5) because the two input values are different.
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. The NULLIF function accepts two arguments.
SELECT ISNULL(NULLIF(listing.Offer_Text, ''), company.Offer_Text) AS Offer_Text FROM ... is the most elegant solution. And to break it down a bit in pseudo code:
10 cze 2023 · The SQL NULLIF function lets you compare two values and determine if they match or not: Match? The function will return NULL. Don’t match? The function will return the first value. Syntax and Parameters. The syntax of the SQL NULLIF function is: NULLIF (expr1, expr2) The parameters of the NULLIF function are:
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)
