Question

我如何选择如果San_Cliente.NomeComple为非空，那么San_Cliente.Excluido = 0？

现在这是我的SELECT

SELECT  Key.Key_Id, 
        Key.User_Id, 
        Key.From, 
        su.CompleteName, 
        Key.Company_Id, 
        Key.User_Id_Responsible, 
        Key.DateTime, 
        Key.Transaction, 
        Key.Client_Id, 
        Key.DateTimeGet, 
        Key.DateTimeDelivered, 
        Key.Hours, 
        Key.ResponsibleName, 
        Key.PersonalId,
        User.CompleteName AS NomeUsuarioVenda, 
        Client.CompleteName 
FROM    San_Chave 
JOIN    User 
    ON  Key.User_Id_Responsible = User.User_Id 
JOIN    User su 
    ON  Key.User_Id = su.User_Id 
LEFT OUTER JOIN Client
    ON  Key.Client_Id = Client.Client_Id 
WHERE   (Key.Delivered = 0 OR Key.Delivered is NULL) 
    and Key.From = 14
    AND User.Deleted = 0

在我的WHERE子句中，我需要把AND Client.Deleted = 0，但是当Client.CompleteName不为null时。

我该怎么做？

Answer 1

最后，添加此条件

AND (San_Cliente.NomeCliente is null OR San_Cliente.Excluido = 0)

因此，如果San_Cliente.NomeCliente为空，则记录传递WHERE子句当它IS NOT NULL时，它会检查附加过滤器。

总结一下，

如果San_Cliente.NomeCompleto不为NULL，则将此条件添加到WHERE子句中：AND San_Cliente.Excluido = 0
如果没有添加条件，则San_Cliente.NomeCompleto为空

Answer 2

你想：

(San_Chave.NomeCompleto IS NULL or (San_Cliente.NomeCompleto IS NOT NULL AND San_Cliente.Excluido = 0))

可能有一种更简洁的方式来表示这种逻辑情况，但我认为这将是最清楚的。

Answer 3

使用合并

coalesce(San_Cliente,0) = 0

http://msdn.microsoft.com/en-us/library/ms190349.aspx

SELECT San_Chave.Chave_Id, San_Chave.Usuario_Id, San_Chave.De, su.NomeCompleto, 
San_Chave.Credenciada_Id, San_Chave.Usuario_Id_Responsavel, San_Chave.DataHora, 
San_Chave.Transacao, San_Chave.Cliente_Id, San_Chave.DataHoraPegou, 
San_Chave.DataHoraDevolverPrevisao, San_Chave.DataHoraEntregou, 
San_Chave.HorasDevolucao, San_Chave.NomeResponsavel, San_Chave.CpfResponsavel, 
San_Chave.RgResponsavel, San_Chave.TelResponsavel, San_Chave.Tel2Responsavel, 
San_Chave.Endereco, San_Chave.Devolvido, San_Chave.TextoDevolucao, 
San_Usuario.NomeCompleto AS NomeUsuarioVenda, San_Cliente.NomeCompleto 
FROM San_Chave JOIN San_Usuario 
ON San_Chave.Usuario_Id_Responsavel = San_Usuario.Usuario_Id 
JOIN San_Usuario su 
ON San_Chave.Usuario_Id = su.Usuario_Id 
LEFT OUTER JOIN San_Cliente 
ON San_Chave.Cliente_Id = San_Cliente.Cliente_Id 
WHERE (San_Chave.Devolvido = 0 OR San_Chave.Devolvido is NULL) 
and San_Chave.De = 14
AND San_Usuario.Excluido = 0 
AND coalesce(San_Cliente,0) = 0

如何使用IF子句进行SELECT

3 个答案: