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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.
This tutorial introduces you to the SQL NULLIF function and shows you how to add the if-else condition to your SQL queries.
1 paź 2024 · Dowiedz się, co to jest SQL NULLIF, jaką ma składnię i zastosowanie. Wyjaśniamy na przykładzie użycia w BigQuery.
27 mar 2013 · To find rows where col is NULL, empty string or whitespace (spaces, tabs): SELECT * FROM table WHERE ISNULL(LTRIM(RTRIM(col)),'')='' To find rows where col is NOT NULL, empty string or whitespace (spaces, tabs): SELECT * FROM table WHERE ISNULL(LTRIM(RTRIM(col)),'')<>''
16 mar 2024 · SQL provides several functions to handle these values more gracefully, allowing for cleaner data presentation and more robust calculations. In this article, we'll explore how to use ISNULL , NULLIF , and COALESCE with practical examples.
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).
