SQL查询将两列值乘以第三列

我想将两列值乘以第三列。这里是我的查询：SQL查询将两列值乘以第三列

select distinct pr.PSProjectId,sfa.CodePattern, case when sfqd.NCR IS null then 'blank' else sfqd.NCR end as NCR 
, 
case when sfqd.NCR !='blank' then 
(Select DATEDIFF(minute,starttime,EndTime) from ShopFloorStatusDetail where ShopFloorActivityId=sfa.ShopFloorActivityId 
and StatusId=8 
) 
else 
DATEDIFF(MINUTE,sfs.ShiftStarTime,sfs.shiftendtime) 
end as timediff, 
(select COUNT(1) from ShopFloorEmployeeTime where ShopFloorShiftId=sfs.ShopFloorShiftId) as totalemployee 

from ShopFloor sf 
inner join Project pr on pr.ProjectId=sf.ProjectId 
inner join ShopFloorActivity sfa on sf.ShopFloorId=sfa.ShopFloorId 
inner join ShopFloorShift sfs on sfs.ShopFloorActivityId=sfa.ShopFloorActivityId 
left join ShopFloorStatusDetail sfsd on sfsd.ShopFloorActivityId=sfs.ShopFloorActivityId 
left join ShopFloorQCDetail sfqd on sfqd.ShopFloorStatusDetailId=sfsd.ShopFloorStatusDetailId 
and sfqd.NCR is not null 
where CAST(sfs.ShiftStarTime as DATE) between '2014/01/06' and '2014/01/07'

和输出从这个查询

PSProjectId CodePattern NCR timediff totalemployee 
0000129495  3TMEU  blank  8    1 
0000130583  3UA1P  blank  1    1 
0000130583  3UA1P  blank  2090   2

现在我想乘列timeDiff测量和totalemployee，并显示在一个新的列。

我该怎么做？请帮忙。

来源

2014-01-30 Mahajan344

'SELECT ... ..，timediff * totalemployee as newcolumn FROM' – Mihai

如果那么简单，我就不会在这里发布查询。 – Mahajan344

我不确定你可以在select中重用别名，如果不使用整个表达式的话。 – Mihai

只需添加一个新列，现有的表达式相乘：

case when sfqd.NCR !='blank' 
    then (Select DATEDIFF(minute,starttime,EndTime) 
      from ShopFloorStatusDetail 
      where ShopFloorActivityId=sfa.ShopFloorActivityId 
       and StatusId=8 
      ) 
    else DATEDIFF(MINUTE,sfs.ShiftStarTime,sfs.shiftendtime) 
end 
* 
(select COUNT(1) 
    from ShopFloorEmployeeTime 
    where ShopFloorShiftId=sfs.ShopFloorShiftId)

另外，在换另一个查询整个现有的查询，并乘以calcualted列：

select 
    PSProjectId, 
    CodePattern, 
    NCR, 
    timediff, 
    totalemployee, 
    timediff * totalemployee 
from 
    ( ...original query here...)

来源

2014-01-30 19:16:55 Joe

SQL查询将两列值乘以第三列

回答

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