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The NULLIF() function returns NULL if two expressions are equal, otherwise it returns the first expression. Syntax
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Edit the SQL Statement, and click "Run SQL" to see the...
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Edit the SQL Statement, and click "Run SQL" to see the...
- Try It Yourself
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.
14 sty 2022 · You can use the Coalesce Function available in SQL to achieve the desired result. It will return the first Non-Null value from the passed parameters. SELECT COALESCE( NULL ,'First Non Null','Alex') COALESCE Keyword
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.
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 expression overview. The NULLIF expression accepts two arguments and returns NULL if two arguments are equal. Otherwise, it returns the first expression. The following shows the syntax of the NULLIF expression: NULLIF(expression1, expression2) Code language: SQL (Structured Query Language) (sql)
