Question

马上就开始了 - 我很陌生。我阅读了以下内容：How do I perform an IF...THEN in an SQL SELECT?但它并没有真正回答我的问题。

基本上我正在尝试做的事情如下：

select
    section_name, *
from
    property.lease_period lp
where
    lp.lease_current_stop_date < getdate() and (lp.lease_status = 'Active' or lp.lease_status = 'Overholding')
    and lp.period_id = @period_id
    and lp.building_id = @building_id
    and not exists
    (
        select 1
        from lease_deal.lease
        where lp.suite_name = tenancy_reference
        and lp.building_id = building_id
    )
    case when(@section_name <> 'ALL')
    then(and upper(section_name) = upper(@section_name))
    end
order by period_id desc

这可能吗？如果是这样，我做错了什么？

铊; DR：

基本上我想：

and upper(section_name) = upper(@section_name)

仅在@section_name不等于'ALL'时才适用于我的where子句

Answer 1

您可以将您的（非工作）CASE更改为

AND (@section_name = 'ALL' OR upper(section_name) = upper(@section_name))

Answer 2

这可以通过更简单的方式完成，而无需使用CASE。它将是这样的：

and ((upper(section_name) = upper(@section_name) and @section_name <> 'ALL') OR @section_name ='ALL')

Answer 3

AND upper(section_name)=CASE WHEN @section_name <> 'ALL' THEN upper(@section_name)
                                                         ELSE upper(section_name)
                        END

使用案例时 - 这可能吗？

3 个答案: