coalesce.md

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

COALESCE

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

{% code title="COALESCE example" %}

SELECT COALESCE(address1, address2, city, state, zipCode)
FROM customers

-- 123 Main Street

{% endcode %}

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.

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