SQL語句中加入語句後的case語句

下面的數據，我需要選擇col4 = 301僅適用於col2 = 1。我得到的數據使用查詢像加入幾桌後 -SQL語句中加入語句後的case語句

/****** Script for SelectTopNRows command from SSMS ******/ 
Select count(*),t.intWeightTypeId,t.locationid,t.airoccupancycode 
from 
(SELECT * 
FROM [AIRWork].[dbo].[t1551_c1_LOSS_StagingLocation_0A578891-5DF8-4F77-8AC4-0A9480148F1F] a 
join [AIRGeography].[dbo].[TblSourceTargetMap_US] b on a.guidareaexternal=b.guidExternalSource 
where locationtypecode='R') t 
group by t.intWeightTypeId,t.locationid,t.airoccupancycode 
order by t.locationid 


col1 col2  col3   col4 
9 4 Loc_PE_14208 301 
31 1 Loc_PE_14208 301 
9 3 Loc_PE_14208 301 
9 2 Loc_PE_14208 301 
14 2 Loc_PE_14209 301 
32 1 Loc_PE_14209 301 
14 4 Loc_PE_14209 301 
14 3 Loc_PE_14209 301 
14 2 Loc_PE_14210 301

來源

2015-02-11 Vasista B

'where col4 = 301 and col2 = 1'？不知道你在... – 2015-02-11 15:18:01

什麼是問題？你爲什麼不添加一個'WHERE'語句？ – 2015-02-11 15:18:04

你應該用where條款做到這一點。假設列與SELECT中的列匹配，則應使用列名稱。你也不需要子查詢來做group by：

SELECT count(*), intWeightTypeId, locationid, airoccupancycode 
    FROM [AIRWork].[dbo].[t1551_c1_LOSS_StagingLocation_0A578891-5DF8-4F77-8AC4-0A9480148F1F] a join 
     [AIRGeography].[dbo].[TblSourceTargetMap_US] b 
     on a.guidareaexternal=b.guidExternalSource 
    WHERE locationtypecode = 'R' AND 
     airoccupancycode = 301 and intWeightTypeId = 1 
    GROUP BY intWeightTypeId, locationid, airoccupancycode 
    ORDER BY locationid

來源

2015-02-11 15:25:21

SQL語句中加入語句後的case語句

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