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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
This tutorial introduces you to the SQL NULLIF function and shows you how to add the if-else condition to your SQL queries.
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.
13 sie 2009 · SELECT count (*) FROM us WHERE a IS NULL or a IS NOT NULL works in Postgres. simply do select count (*) - count (a) as num_null, count (a) as num_not_null from us; counting a column returns the number of non null values, substract it from count (*) and you're gold.
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.
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 · 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. In this case, both arguments are identical and so the result is NULL.
