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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 with the IS NULL and IS NOT NULL operators. A NULL value is a field with no value, not a zero or a blank one.

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.dofactory.com › sql › where-isnullSQL IS NULL | IS NOT NULL - Dofactory

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   21 gru 2023 · A WHERE IS NULL clause returns rows with columns that have NULL values. WHERE IS NOT NULL returns rows with column values that are not NULL.

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

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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.

6. 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.

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. Subscribe. Syntax. The syntax for the IS NULL condition in SQL is: expression IS NULL. Parameters or Arguments. expression.