MySQL Tutorial

A database system used with PHP.

Chapter Quiz Exercises
Course Topics
MySQL Intro MySQL SELECT MySQL SELECT DISTINCT MySQL WHERE MySQL ORDER BY MySQL AND, OR, NOT MySQL INSERT INTO MySQL NULL Values MySQL UPDATE MySQL DELETE MySQL LIMIT MySQL MIN() and MAX() MySQL COUNT(), AVG(), SUM() MySQL LIKE MySQL IN MySQL BETWEEN MySQL Aliases MySQL INNER JOIN MySQL LEFT JOIN MySQL RIGHT JOIN MySQL GROUP BY MySQL HAVING MySQL Create DB MySQL Drop DB MySQL Create Table MySQL Drop Table MySQL Alter Table MySQL Constraints MySQL Auto Increment MySQL Views

MySQL NULL Values

MySQL NULL Values

A field with a NULL value is a field with no value.

If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this field. Then, the field will be saved with a NULL value.

How to Test for NULL Values?

We use the IS NULL and IS NOT NULL operators.

SELECT * FROM table_name WHERE column_name IS NULL;

Try It Yourself

Edit the code below and click Run to see the result live.

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Topics
MySQL Intro MySQL SELECT MySQL SELECT DISTINCT MySQL WHERE MySQL ORDER BY MySQL AND, OR, NOT MySQL INSERT INTO MySQL NULL Values MySQL UPDATE MySQL DELETE MySQL LIMIT MySQL MIN() and MAX() MySQL COUNT(), AVG(), SUM() MySQL LIKE MySQL IN MySQL BETWEEN MySQL Aliases MySQL INNER JOIN MySQL LEFT JOIN MySQL RIGHT JOIN MySQL GROUP BY MySQL HAVING MySQL Create DB MySQL Drop DB MySQL Create Table MySQL Drop Table MySQL Alter Table MySQL Constraints MySQL Auto Increment MySQL Views