MySQL IS NULL & IS NOT NULL Tutorial- Shikshaglobe

MySQL IS NULL & IS NOT NULL Tutorial - Learn how to use the MySQL IS NULL and IS NOT NULL operators to test for NULL values in your database. These operators are used to test whether a value is null or not null.MySQL IS NULL operator tests for NULL values. IS NOT NULL is the inverse of IS NULL; it tests for non-NULL values. If a value in a column is NULL it means that the value is unknown or missing. You can use the IS NULL and IS NOT NULL operators to test for missing values in a column. For example if you have a customer table with a last_name column you can find all customers who do not have a last name:IS NULL and IS NOT NULL are two operators used with the MySQL WHERE clause to test for a NULL or non-NULL value respectively. A NULL value in a MySQL database is equivalent to the absence of a value. This means that it is not possible to test for NULL values with comparison operators such as = < or >. Instead the IS NULL and IS NOT NULL operators must be used.The IS NULL operator returns true if the value of its operand is NULL and false if the value of its operand is not NULL. The syntax of the IS NULL operator is as follows:expression IS [NOT] NULLThe expression can be any valid expression. The IS NOT NULL operator returns true if the value of its operand is not NULL and false if the value of its operand is NULL. The syntax of the IS NOT operator is as follows:expression IS [NOT] NULL.

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