Question

这是我的查询，不编译：

Select 1 from dbo.EmailAddresses e
    Inner Join Users u On e.UserID = u.UserID
        Where LOWER(EmailAddress) = @EmailAddress               
        And
    Case When @For = 1 Then e.JurisdictionID IS NOT NULL  When @For = 2 Then e.AccountID IS NOT NULL  End

有人能告诉我一种在没有动态查询的情况下编写此查询的方法，即在字符串中构建查询吗？

Answer 1

这应该有效：

Select 1 from dbo.EmailAddresses e
    Inner Join Users u On e.UserID = u.UserID
        Where LOWER(EmailAddress) = @EmailAddress               
        And (
            (@For = 1 AND e.JurisdictionID IS NOT NULL) OR
            (@For = 2 AND e.AccountID IS NOT NULL)
        )

Answer 2

尝试简单而且有一种方法可以在没有案例的情况下尝试..

Select 1 from dbo.EmailAddresses e 

    Inner Join Users u On e.UserID = u.UserID 
        Where LOWER(EmailAddress) = @EmailAddress                        
And  (   (@For = 1 and e.JurisdictionID IS NOT NULL)
        or ( @For = 2 and e.AccountID IS NOT NULL  ))

Conditional Where子句：除了动态查询之外还有什么方法可以写？

2 个答案: