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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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NULLIF is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL. We recommend that you not use time-dependent functions, such as RAND(), within a NULLIF function.
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:
This tutorial introduces you to the SQL NULLIF function and shows you how to add the if-else condition to your SQL queries.
Using NULLIF expression to translate a blank string to NULL. The NULLIF expression comes in handy when you’re working with legacy data that contains a mixture of null and empty strings in a column. Consider the following example. First, create a new table named sales.leads to store the sales leads:
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).
This SQL Server tutorial explains how to use the NULLIF function in SQL Server (Transact-SQL) with syntax and examples. In SQL Server (Transact-SQL), the NULLIF function compares expression1 and expression2.
