Replace null with 0 in MySQL

Question

I am getting NULL values in the results of an operation in MySQL.

Is there a way to convert the NULL values into the value 0?

Answer 1

Yes, by using COALESCE.

SELECT COALESCE(null_column, 0) AS null_column FROM whatever;

COALESCE goes through the list of values you give it, and returns the first non-null value.

Answer 2

I am adding this answer because no one mentioned IFNULL function

You can use IFNULL

SELECT IFNULL(column_name, 0) FROM table_name; 

IFNULL will return column's value (if it has something other than NULL) otherwise second parameter passed (in this case 0).