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xthiago/coalesce-retornar-um-valor-ao-inves-de-null.md

Last active August 29, 2015 14:05
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SQL COALESCE - Retornar um valor ao invés de NULL
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coalesce-retornar-um-valor-ao-inves-de-null.md

Ao invés de fazer uma querie enorme com CASE-THEN-ELSE, usar a função COALESCE. Ela retorna o primeiro argumento NOT NULL.

Isso:

SELECT CASE WHEN evento.realizado_em IS NULL THEN '' ELSE evento.realizado_em END FROM TableA

Vira isso:

SELECT COALESCE(evento.realizado_em, '') FROM TableA

Bem mais sucinto :)

PS: Testado no MySQL

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