Question

我试图摆脱所有CPAC_FR，如下所示

Facility Response   CPAC_FR Transfer Call        2016-03-07         1
Facility Response   CPAC_FR Fulfillment-Email   2016-03-04  4
Facility Response   CPAC_FR Fulfillment-Email   2016-03-10  1
Facility Response   CPAC_FR Fulfillment-Email   2016-03-17  2
Facility Response   CPAC_FR Fulfillment-Email   2016-03-21  2

这是我的代码。我还在学习如何编写查询，所以我不断陷入困境。

SELECT  SR_AREA, INS_PRODUCT, RESOLUTION_CD, CAST(CREATED AS DATE) AS DATEADD
      , COUNT(*) AS TOTAL
FROM    S_SRV_REQ WITH (NOLOCK)          
WHERE   (dbo.fn_dstoffset(CREATED) >= '3-1-2016')  
AND (dbo.fn_dstoffset(CREATED) <= DATEADD(D, 1, '3-31-2016'))  
AND  [SR_AREA] IS NOT NULL 
GROUP BY INS_PRODUCT, RESOLUTION_CD, SR_AREA,  CAST(CREATED AS DATE) 
ORDER BY SR_AREA,INS_PRODUCT,RESOLUTION_CD DESC

我更倾向于添加DELETE FROM .. WHERE ..

我使用的是Microsoft SQL Server Management Studio。

Answer 1

使用单个表时 - 一旦您的SELECT语句仅返回您要实际删除的数据，您就可以将'SELECT替换为DELETE并删除子句{ {1}}和GROUP BY。在你的例子中，你最终会得到这个：

ORDER BY

附注：

考虑到FK约束，更新可能因约束而失败，或者可能会根据FK约束设置级联删除约束记录。
建议始终首先在非生产设置中测试DELETE语句，以确保它们按预期运行。
最后，让同事在生产环境中执行之前审查DELETE语句也绝不是一个坏主意。

修改

我假设DELETE FROM S_SRV_REQ WHERE (dbo.fn_dstoffset(CREATED) >= '3-1-2016') AND (dbo.fn_dstoffset(CREATED) <= DATEADD(D, 1, '3-31-2016')) AND [SR_AREA] IS NOT NULL你的意思是Trying to delete data from a row 表。您无法从行中删除数据，但如果该列允许可以为空的数据/值，则可以将行中的值更新为Trying to delete data from a。如果是这种情况，请相应更新您的问题。

Answer 2

删除不适用于组从选择开始，并确保这些是您要删除的行

SELECT  SR_AREA, INS_PRODUCT, RESOLUTION_CD, CAST(CREATED AS DATE) AS DATEADD
FROM    S_SRV_REQ        
WHERE   (dbo.fn_dstoffset(CREATED) >= '3-1-2016')  
AND     (dbo.fn_dstoffset(CREATED) <= DATEADD(D, 1, '3-31-2016'))  
AND     [SR_AREA] IS NOT NULL

然后只需更改选择....行删除

DELETE 
FROM    S_SRV_REQ        
WHERE   (dbo.fn_dstoffset(CREATED) >= '3-1-2016')  
AND     (dbo.fn_dstoffset(CREATED) <= DATEADD(D, 1, '3-31-2016'))  
AND     [SR_AREA] IS NOT NUL

尝试从COLUMN中删除数据

2 个答案: