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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 what a NULL value is and how to test for it in SQL. See examples of using IS NULL and IS NOT NULL operators to select records with or without empty values.

2. 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.

3. www.sqlshack.com › working-with-sql-null-valuesWorking with SQL NULL values - SQL Shack

   www.sqlshack.com › working-with-sql-null-values

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   19 maj 2021 · Learn how to handle SQL NULL values with IS NULL, IS NOT NULL, ISNULL, COALESCE, and other functions. See examples of queries, problems, and solutions related to NULL values.

4. www.geeksforgeeks.org › sql-null-valuesNULL values in SQL - GeeksforGeeks

   www.geeksforgeeks.org › sql-null-values

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   24 kwi 2023 · Learn what NULL values are, how they differ from zero or empty values, and how to test, update, and use them in SQL queries. See examples, principles, and logic of NULL values in a table.

5. www.mssqltips.com › sqlservertip › 8026What does SQL NULL mean and how to handle NULL values - SQL...

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   20 cze 2024 · Learn what NULL means in SQL Server and how it affects queries, aggregates, and string manipulation. See examples of NULL values, ISNULL function, and COALESCE function.

6. stackoverflow.com › questions › 6362112sql - IN Clause with NULL or IS NULL - Stack Overflow

   stackoverflow.com › questions › 6362112

   Given a null value in id_field, the coalesce function would instead of null return 'unik_null_value', and by adding 'unik_null_value to the IN-list, the query would return posts where id_field is value1-3 or null.

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