难以在 case 语句中给出别名

Question

我有一个查询，它给我的输出如下面的屏幕截图所示。

select 
    a.storeId, b.district, b.region,
    count (case when a.photoAppImage is null then 1 end) as via_u,
    count (case when a.photoAppImage =1 then 1 end) as via_p
from 
    used_listings_V2 a
left outer join 
    locations b on a.storeId = b.storeID 
where 
    convert(date, a.imageUpdateDate) = convert(date, GETDATE()-1)
group by 
    a.storeId, b.district, b.region

已编辑

我想将我在一行中得到的两个不同列中的计数分开。具有空 photoAppImage 的所有记录的计数应显示在“Via_u”下方，而具有 1 个 photoAppImage 的记录的计数应显示在“Via_p”下方。预期的输出将如下所示：

基本上我认为我很难在 case 语句中给出别名。有人可以帮我解决这个问题吗？

Answer 1

使用：

Count(case when a.photoappimage is null then 1 end) as via_u,
Count(case when a.photoappimage is null then 1 end)/100. as via_u_pct,
Count(case when a.photoappimage=1 then 1 end ) as via_p,
Count(case when a.photoAppImage is null or a.photoAppImage=1 then 1 end) as via_u_or_p

更新：合并所有（并使用子查询来简化 pct 计算）：

select 
    storeId, 
    district,
    region,
    via_u,
    via_p,
    via_u/100./(via_u+via_p) as via_u_pct
from (
    select 
        a.storeId, b.district, b.region,
        count (case when a.photoAppImage is null then 1 end) as via_u,
        count (case when a.photoAppImage =1 then 1 end) as via_p
    from 
        used_listings_V2 a
    left outer join 
        locations b on a.storeId = b.storeID 
    where 
        convert(date, a.imageUpdateDate) = convert(date, GETDATE()-1)
    group by 
        a.storeId, b.district, b.region
    ) Step1

难以在 case 语句中给出别名

difficulty giving aliases inside case statement

sql

sql-server