一、臨時表妙用

-- 1、將老庫中的mediaid和新庫中的regionid對應上，然后插入到臨時表中
SELECT * INTO #TempMediaRegion FROM (SELECT ww.C_MEDIA,C_ID FROM [NEWSYS].[LMSData].[dbo].Base_Region
right JOIN openquery(CRM, 'select * from T_LOCREGION') ww
ON C_CrmID=ww.C_REGION) hh

-- 2、將媒體按媒體分組
SELECT * INTO #TempLocalMediaRegion FROM (SELECT ww.C_MEDIA,
stuff((select ','+cast(C_ID as NVARCHAR(50)) FROM #TempMediaRegion where C_MEDIA=ww.C_MEDIA for xml path('')),1,1,'') b
FROM #TempMediaRegion ww GROUP BY C_MEDIA) sf

--3、 更新媒體表（地區）
UPDATE [NEWSYS].[LMSData].[dbo].Base_Media SET C_RegionID=#TempLocalMediaRegion.b FROM [NEWSYS].[LMSData].[dbo].Base_Media
LEFT JOIN #TempLocalMediaRegion ON C_CrmID=#TempLocalMediaRegion.C_MEDIA

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二、連表更新

-- 更新
UPDATE M SET M.C_ParentId = MM.c_id FROM dbo.Base_Media M LEFT JOIN dbo.Base_Media MM ON M.c_crmparentid = mm.C_CrmID

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三、sqlserver 相當于 mysql contact的用法

SELECT * INTO #TempLocalMediaRegion FROM (SELECT ww.C_MEDIA,
stuff((select ','+cast(C_ID as NVARCHAR(50)) FROM #TempMediaRegion where C_MEDIA=ww.C_MEDIA for xml path('')),1,1,'') b
FROM #TempMediaRegion ww GROUP BY C_MEDIA) sf

臨時表妙用、連表更新、sqlserver group contant