Question

我有这样的查询：

SELECT v.Vtype,
       SUM(DATEDIFF(MI, t.Paydate, t.DelDate)) AS TotalDiff,
       CONVERT(DECIMAL(10, 1), 
               AVG(CONVERT(NUMERIC(18, 2), DATEDIFF(MI, t.Paydate, t.DelDate)))) AS Average
FROM   Transaction_tbl t
       LEFT JOIN VType_tbl v
         ON t.vtid = v.vtid
WHERE  t.Locid = 5
GROUP  BY v.Vtype

平均来自Transaction_tbl t在t.vtid = v.vtid上加入VType_tbl v，其中t.Locid = 5 by v.Vtype

我的输出：

Vtype                         TotalDiff   Average
-------------------------------------------------- -
Emaar Staff                     NULL        NULL
Normal                         14044       189.8
VIP                             85          2.1
VVIP                               5           2.5

但我想这样出来：

VtypeE      Etotaldiff       Eaverage  VtypeN  Ntot   Naverge  vtypev  vtot  vaverg
Emaar Staff  null             null     Normal   14044    189.8   VIP     85       2.1

Answer 1

您正试图将结果全部放回一行。但是，列有不同的类型。这意味着内置的pivot不太实用。您可以通过显式聚合原始查询来执行您想要的操作：

with cte as (
      SELECT v.Vtype, SUM(DATEDIFF(MI, t.Paydate, t.DelDate)) AS TotalDiff,
            CONVERT(DECIMAL(10, 1), 
            AVG(CONVERT(NUMERIC(18, 2), DATEDIFF(MI, t.Paydate, t.DelDate)))) AS Average
      FROM   Transaction_tbl t LEFT JOIN
             VType_tbl v
             ON t.vtid = v.vtid
     WHERE  t.Locid = 5
     GROUP  BY v.Vtype 
   )
select 'Emaar Staff' as VtypeE,
       max(case when type = 'Emaar Staff' then TotalDiff end) as ETotalDiff,
       max(case when type = 'Emaar Staff' then Average end) as EAverage,
       'Normal' as VtypeN,
       max(case when type = 'Normal' then TotalDiff end) as NTotalDiff,
       max(case when type = 'Normal' then Average end) as NAverage,
       'VIP' as VtypeV,
       max(case when type = 'VIP' then TotalDiff end) as VTotalDiff,
       max(case when type = 'VIP' then Average end) as VAverage
from cte;

将列结果转换为sql中的行结果

1 个答案: