Important Points About MySQL ISNULL() Function
- The ISNULL() function is used to check if a value is NULL or not.
- It returns 1 if the expression is NULL, otherwise it returns 0.
- It can be used in SELECT, WHERE, and other clauses.
- It is different from the IFNULL() function, which is the MySQL equivalent of SQL Server’s ISNULL().
- It is useful for handling NULL values in queries and filtering rows where a column is NULL or not NULL.
MySQL ISNULL( ) Function
The MySQL ISNULL() function is used for checking whether an expression is NULL or not.
This function returns 1 if the expression passed is NULL; otherwise, it returns 0. The ISNULL() function in MySQL accepts the expression as a parameter and returns an integer with a value of a value 0 or 1 depending on the parameter passed.
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