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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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9 paź 2008 · select datename(month, str(year(getdate()), 4) + replace(str(@month, 2), ' ', '0') + '01')
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 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.
1 paź 2024 · Dowiedz się, co to jest SQL NULLIF, jaką ma składnię i zastosowanie. Wyjaśniamy na przykładzie użycia w BigQuery.
The CASE expression is verbose while the NULLIF expression is much shorter and more readable. In this tutorial, you have learned how to use the SQL Server NULLIF expression to return NULL if the first argument equals to the second one.
