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Categories: Conditional

COALESCE

Evaluates the arguments in order and returns the value of the first expression that does not contain NULL.

Syntax​

COALESCE(expression1, expression2, [ ..., expressionN ]) → same as input type​

  • expression: A combination of symbols and operators that the database evaluates to obtain a single data value. Expressions can be a single constant, variable, column, or scalar function.

Examples

COALESCE example 
SELECT COALESCE(address1, address2, city, state, zipCode)
FROM customers
-- 123 Main Street

Usage Notes​

All arguments in the SELECT statement must have the same data type. Requires a minimum of two arguments, but there is no set maximum limit.