[pgbr-geral] Dúvida SQL Server X PostgreSQL: IF NOT EXISTS

Mon, 27 Aug 2007 15:24:55 -0700 

Olá a todos!
como faço o seguinte comando do sql server, no postgresql?

        IF NOT EXISTS (SELECT TOP 1 bco_codigo
                                        FROM Banco
                                        WHERE bco_codigo = '001')
        BEGIN
                INSERT INTO Banco
                        (bco_codigo,
                        bco_nome)
                VALUES
                        ('001',
                        'Banco do Brasil')                      
        END 
        ELSE
        BEGIN
                UPDATE Banco
                SET bco_codigo  = '001',
                        bco_nome        = 'BB - Banco do Brasil SA '            
        
                WHERE bco_codigo = '001'
        END


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