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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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8 sie 2024 · 5. NULLIF() The NULLIF function compares two expressions. If they are equal, the function returns null. If they are not equal, the function returns the first expression. You cannot specify the literal NULL for first expression. Syntax – NULLIF (expr_1, expr_2) Examples –
This tutorial introduces you to the SQL NULLIF function and shows you how to add the if-else condition to your SQL queries.
8 maj 2022 · NULLIF() is a SQL-standard feature (it’s included in the ISO/IEC 9075 specification). Syntax. The syntax goes like this: NULLIF (V1, V2) This is equivalent to the following CASE expression: CASE WHEN V1=V2 THEN NULL ELSE V1 END Example. Here’s an example to demonstrate: SELECT NULLIF( 12, 12 ); Result: NULL
The most common NULL functions are ISNULL(), COALESCE(), and NULLIF(). 1. ISNULL (): The ISNULL() function is used to replace NULL values with a specified value. The syntax of the ISNULL() function is as follows: ISNULL(expression, value_if_null) expression: the field or value to check for NULL.
Practice writing SQL to call data from the warehouse and sync it into Google Sheets in this 5 minute interactive demo. The complete guide to SQL NULLIF. Learn the syntax, parameters, use cases and find practical examples in the Hightouch SQL Dictionary.
The SQL NULLIF() function is, used to verify whether the two expressions are equal or not. It accepts two parameters expr1 and expr2 and returns NULL , if both the expression are equal; else returns the first expression.
