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Select condicional



Gostaria de saber se tem como fazer um select nas colunas do banco, condicionando se existir a coluna, ignore, caso contrário, adicione tal coluna.


Ex.: IF NOT EXISTS (SELECT * FROM information_schema.columns WHERE table_schema = 'estado' and column_name = 'id_pais')

ALTER TABLE estado ADD id_pais CHAR(4) DEFAULT '1058';


A ideia é essa, mas não consegui chegar a uma sintaxe correta.

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