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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 NULLIF() function returns NULL if two expressions are equal, otherwise it returns the first expression. Syntax
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 tutorial introduces you to the SQL NULLIF function and shows you how to add the if-else condition to your SQL queries.
21 mar 2022 · In this SQL tutorial, we have reviewed the SQL (structured query language) functions COALESCE(), ISNULL(), NULLIF() and how these work in SQL Server, Oracle and PostgreSQL. There are also other ways for checking NULL values such as the IS NULL clause and there are other complex functions in Oracle.
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 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.
