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1. www.w3schools.com › sql › sql_null_valuesSQL NULL Values - IS NULL and IS NOT NULL - W3Schools

   www.w3schools.com › sql › sql_null_values

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   Learn how to test for NULL values in SQL using the IS NULL and IS NOT NULL operators. A NULL value is a field with no value, different from zero or spaces.

2. learn.microsoft.com › en-us › sqlISNULL (Transact-SQL) - SQL Server | Microsoft Learn

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   3 wrz 2024 · Replaces NULL with the specified replacement value. Transact-SQL syntax conventions. Syntax ISNULL ( check_expression , replacement_value ) Arguments check_expression. The expression to be checked for NULL. check_expression can be of any type. replacement_value. The expression to be returned if check_expression is NULL.

3. stackoverflow.com › questions › 9581745SQL is null and = null - Stack Overflow

   stackoverflow.com › questions › 9581745

   6 mar 2012 · SQL provides the special syntax for testing if a column is null, via is null and is not null, which is a special condition to test for a null (or not a null). Here's some SQL showing a variety of conditions and and their effect as per above.

4. www.baeldung.com › sql › select-null-empty-stringsFind Null or Empty Values in SQL - Baeldung

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   6 cze 2024 · MS SQL provides a function ISNULL to check for null values: SELECT id, name FROM Department WHERE ISNULL (code, '') = '' OR TRIM (code) = ''; The ISNULL function in MS SQL takes two arguments: the first is a value or column name, and the second is the default value if the first argument is null.

5. www.mssqltips.com › sqlservertip › 6776Using the SQL ISNULL() Function - SQL Server Tips

   www.mssqltips.com › sqlservertip › 6776

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   The ISNULL () function is used to check if a value is null and if it is will return the replacement value specified when calling the function. Understanding NULL Values. Before we get into the details of the function it is important to make sure we understand what a NULL value is in SQL Server.

6. www.techonthenet.com › sql › is_nullSQL: IS NULL Condition - TechOnTheNet

   www.techonthenet.com › sql › is_null

   The IS NULL condition is used in SQL to test for a NULL value. It returns TRUE if a NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.

7. learnsql.com › cookbook › how-to-select-null-values-in-sqlHow to Select NULL Values in SQL - LearnSQL.com

   learnsql.com › cookbook › how-to-select-null-values-in-sql

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   NULL in SQL is used to indicate a missing or unknown value. NULL is special: it is different from all other values, including zero and an empty text field. To test for NULL values specifically in SQL, you must use a special operator IS NULL. It is impossible to test for the NULL value using any of the usual comparison (such as = or <>) operators.