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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. stackoverflow.com › questions › 3369041sql - Select rows where column is null - Stack Overflow

   stackoverflow.com › questions › 3369041

   18 maj 2011 · On MS SQL Server, the ISNULL () function returns the first argument if it's not NULL, otherwise it returns the second. You can effectively use this to make sure a query always yields a value instead of NULL, e.g.: SELECT ISNULL (column1, 'No value found') FROM mytable WHERE column2 = 23.

3. www.sqltutorial.org › sql-is-nullSQL IS NULL - SQL Tutorial

   www.sqltutorial.org › sql-is-null

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   Learn what NULL means in SQL and how to use the IS NULL and IS NOT NULL operators to test if an expression is NULL or not. See examples with the employees table and compare with other operators.

4. 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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   Learn how to use the IS NULL and IS NOT NULL operators to retrieve rows with NULL or non-NULL values in a given column. See examples, explanations, and contrast with regular comparison operators.

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

   www.baeldung.com › sql › select-null-empty-strings

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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.

6. www.programiz.com › sql › is-null-not-nullSQL IS NULL and IS NOT NULL (With Examples) - Programiz

   www.programiz.com › sql › is-null-not-null

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   In SQL, the IS NULL condition is used to select rows if the specified field is NULL. It has the following syntax: SELECT column1, column2, ... FROM table WHERE column_name IS NULL; Here, column1, column2, ... are the table columns.

7. 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.