zoukankan      html  css  js  c++  java
  • 临时表妙用、连表更新、sqlserver group contant

    一、临时表妙用


    -- 1、将老库中的mediaid和新库中的regionid对应上,然后插入到临时表中
    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、将媒体按媒体分组
    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、 更新媒体表(地区)
    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

    二、连表更新

    -- 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

    三、sqlserver 相当于 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

  • 相关阅读:
    Sudoku Solver [LeetCode]
    Populating Next Right Pointers in Each Node [LeetCode]
    Binary Tree Level Order Traversal [LeetCode]
    Clone Graph [LeetCode]
    Merge k Sorted Lists [LeetCode]
    Combinations [LeetCode]
    021 面向对象 一
    给图片加点料
    质数
    ex10 找出藏在字符串中的“密码”
  • 原文地址:https://www.cnblogs.com/honghong75042/p/3687880.html
Copyright © 2011-2022 走看看