MySQL COALESCE() Function

MySQL Functions : Return the first non-null value in a list

Definition and Usage

The COALESCE() function returns the first non-null value in a list.

COALESCE(val1, val2, ...., val_n)

Parameter	Description
val1, val2, val_n	Required. The values to test

Works in:	From MySQL 4.0

Return the first non-null value in a list:

SELECT COALESCE(NULL, 1, 2, 'W3C');

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