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COALESCE

Syntax

COALESCE(expr1 {, exprN })

COALESCE returns the first expression that is not NULL. The expressions are evaluated in the order in which they are specified. This function is usually used to replace NULL values with a not NULL value.

Example

This example selects title and price for all books. If the price for a given title is NULL, the price shown is 0.00.

SELECT title, COALESCE(price, 0.00) AS price
FROM titles; 

Equivalents in other databases

TABLE 90. Equivalents in other databases
IBM DB2
COALESCE function
Oracle
NVL function


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