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  1. stackoverflow.com › questions › 17832906How to check if field is null or empty in MySQL?

    6 gru 2016 · SELECT ifnull(nullif(field1,''),'empty or null') AS field1 FROM tablename; How it works: nullif is returning NULL if field is an empty string, otherwise returns the field itself. This has both the cases covered (the case when field is NULL and the case when it's an empty string).

  2. www.w3schools.com › sql › func_mysql_ifnullMySQL IFNULL() Function - W3Schools

    The IFNULL() function returns a specified value if the expression is NULL. If the expression is NOT NULL, this function returns the expression. Syntax

  3. www.w3schools.com › mysql › mysql_null_valuesMySQL NULL Values - IS NULL and IS NOT NULL - W3Schools

    Learn how to test for NULL values in MySQL using the IS NULL and IS NOT NULL operators. See examples, syntax, and a demo database with customers and their addresses.

  4. www.mysqltutorial.org › mysql-control-flow-functions › mysql-ifnullMySQL IFNULL - Practical Examples of IFNULL Function - MySQL...

    If you want to check if a value is NULL or not, you can use IS NULL or IS NOT NULL in the WHERE clause. In this tutorial, we have introduced you to MySQL IFNULL function and shown you how to use the IFNULL function in the queries.

  5. www.geeksforgeeks.org › how-to-check-a-column-is-empty-or-null-in-mysqlHow to Check a Column is Empty or Null in MySQL?

    2 lut 2024 · To determine if a column is empty or null in MySQL, we utilize the IS NULL and IS NOT NULL conditions in a SELECT statement. To ascertain if a column is empty or null in SQL, use COALESCE (column, '') or column IS NULL OR column = ''.

  6. mysqlcode.com › mysql-isnull-ifnullMySQL ISNULL() and IFNULL() Functions - MySQLCode

    25 kwi 2021 · The MySQL ISNULL() function is used to check for any NULL values in the expression passed to it as a parameter. If the expression has/results to NULL, it displays 1. If the expression does not have or result in NULL, the function returns 0. The MySQL IFNULL() function is used to return a specified value if the expression is NULL.

  7. www.mysqltutor.com › mysql-ifnull-functionMySQL IFNULL function

    The IFNULL function in MySQL is used to handle NULL values in a query by replacing them with a specified alternative value. This function is particularly useful when you want to display a default value or perform some other action if a column contains NULL.

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