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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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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.
SQL NULLIF examples. The following statement returns NULL because 100 is equal to 100. SELECT NULLIF (100, 100); Code language: SQL (Structured Query Language) (sql) The following statement returns 100 because 100 is less than 200, the NULLIF function returns the first argument which is 100.
The following example creates a budgets table, loads data, and uses NULLIF to return a null if current_year is null or contains the same data as previous_year.
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:
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:
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.
