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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. Transact-SQL syntax conventions. Syntax NULLIF ( expression , expression ) Arguments. expression
This tutorial introduces you to the SQL NULLIF function and shows you how to add the if-else condition to your SQL queries.
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)
This simple combination of COALESCE and NULLIF should do the trick: SELECT Coalesce(NULLIF(listing.OfferText, ''), company.OfferText) As Offer_Text ... Note: Add another empty string as the last COALESCE argument if you want the statement to return an empty string instead of NULL if both values are 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).
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:
