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Example. Compare two expressions: SELECT NULLIF(25, 25); Try it Yourself » 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:
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10 cze 2023 · The SQL NULLIF function lets you compare two values and determine if they match or not: Match? The function will return NULL. Don’t match? The function will return the first value. Syntax and Parameters. The syntax of the SQL NULLIF function is: NULLIF (expr1, expr2) The parameters of the NULLIF function are:
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.
This tutorial introduces you to the SQL NULLIF function and shows you how to add the if-else condition to your SQL queries.
Returns a null value if the two specified expressions are equal. For example, SELECT NULLIF(4,4) AS Same, NULLIF(5,7) AS Different; returns NULL for the first column (4 and 4) because the two input values are the same.
8 maj 2022 · Example. Here’s an example to demonstrate: SELECT NULLIF( 12, 12 ); Result: NULL. In this case, both arguments are identical and so the result is NULL. Depending on your RDBMS, the actual output for NULL values may be different.
SQL Server NULLIF examples. Let’s take some examples of using the NULLIF expression. Using NULLIF expression with numeric data examples. This example returns NULL because the first argument equals the second one: SELECT NULLIF (10, 10) result; Code language: SQL (Structured Query Language) (sql) Here is the output:
