This page showing how the NOT NULL CONSTRAINT confirms that a column cannot have NULL value in CREATE TABLE statement.

In this page we are going to discuss, how the NULL works with the UPDATE statement.

The SQL INSERT statement can also be used to insert NULL value for a column.

The SQL AVG() function calculates NON NULL values.

In this page we are discussing the usage of NOT NULL operator with the select statement.

In this page we are discussing the usage of NULL operator with the select statement.

SQL Null check is performed using either IS NULL or IS NOT NULL to check whether a value in a field is NULL or not.

Before storing a value in any field of a table, a NULL value can be stored; later that NULL value can be replaced with a desired value.

MySQL UPDATE command can be used to update a column value to NULL by setting column_name = NULL, where column_name is the name of the column to b updated.

MySQL allows you to create table with SET NULL option. Doing so will delete or update the row from the parent table, and set the foreign key column or columns in the child table to NULL.