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  • 比较2个数据库的差异

    对已经运行的系统进行大规模模块开发之后,对数据库和程序修改比较大。

    如果开始开发的时候没有严格要求,或者人员没有按照要求做,或者人员离职交接不合格,很容易造成文档不完整,必须比较两个数据库的差别。

    下面的SQL比较出两个数据库中表结构有差的地方。

     
     
    SELECT  obj.name AS TableName, col.name AS ColName, col.xtype, 
          col.length
    into #tmp1
    FROM eShipping_New_QA_User_1_BackUp.dbo.syscolumns col INNER JOIN
          eShipping_New_QA_User_1_BackUp.dbo.sysobjects obj ON col.id = obj.id
    ORDER BY obj.name
    
    SELECT  obj.name AS TableName, col.name AS ColName, col.xtype, 
          col.length
    into #tmp2
    FROM eShipping_20140805.dbo.syscolumns col INNER JOIN
          eShipping_20140805.dbo.sysobjects obj ON col.id = obj.id
    ORDER BY obj.name
    
    select  tablename,colname,0 as xtypeold,0 as lengthold,0 as xtypenew,0 as lengthnew
    into #tmp3
    from (select tablename,colname from #tmp1 union select tablename,colname from #tmp2)
    b
    
    update #tmp3 set xtypeold=#tmp1.xtype,lengthold=#tmp1.length  from #tmp1 where #tmp3.tablename=#tmp1.tablename and
    #tmp3.colname=#tmp1.colname
    
    update #tmp3 set xtypenew=#tmp2.xtype,lengthnew=#tmp2.length  from #tmp2 where #tmp3.tablename=#tmp2.tablename and
    #tmp3.colname=#tmp2.colname
    
    select * from #tmp3
    where xtypeold<>xtypenew or lengthold<>lengthnew 
    
    drop table #tmp1
    drop table #tmp2
    drop table #tmp3
    View Code


     

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  • 原文地址:https://www.cnblogs.com/wonder223/p/3897905.html
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