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  • SQL Server比较2table字段的差异

    由于项目前后用了2个数据库,需要统计数据库结构的变化,需要统计每个表的变化,由于人工核对挺浪费时间,就写了一点代码:

    1.统计表的字段数量(查询表有多少列):

      select count(name)  from syscolumns where  id=object_id('表名')

      eg:select count(name)  from syscolumns where  id=object_id('t_dk')

    2.查询数据库字段名 (表有哪些字段)

      select name  

      from 数据库名.dbo.syscolumns  

      where id=(

        select id from 数据库名.dbo.sysobjects  where name='表名'

      )

      eg:

      select name 

      from Catsic_Compare0803DiLong_2017080311.dbo.syscolumns  

      where id=(

        select id from Catsic_Compare0803DiLong_2017080311.dbo.sysobjects  where name='t_cbjzc'

      )

    3.比较两个数据库相应表的差异(查询表对应的字段是否一致)

      本部分是基于2写的:

    select * from (
      select name 
      from 数据库A.dbo.syscolumns 
      where id=(
        select id from 数据库A.dbo.sysobjects 
        where name='表名A')
    ) T1 FULL OUTER JOIN(
      select name from 数据库B.dbo.syscolumns 
      where id=(
        select id from 数据库B.dbo.sysobjects 
        where name='表B'
      )
    ) T2 on T1.name=T2.name

      eg:

    select * from (
      select name 
      from Catsic_Compare0803DiLong_2017080311.dbo.syscolumns 
      where id=(
        select id from Catsic_Compare0803DiLong_2017080311.dbo.sysobjects 
        where name='t_cbjzc')
    ) T1 FULL OUTER JOIN(
      select name from Catsicgl_43_2016Eroad_2017111110.dbo.syscolumns 
      where id=(
        select id from Catsicgl_43_2016Eroad_2017111110.dbo.sysobjects 
        where name='t_cbjzc'
      )
    ) T2 on T1.name=T2.name

    只显示字段字段名有差异的字段,增加一个条件即可where T1.name is null or T2.name is null

    即全部code:

    select * from (
      select name 
      from Catsic_Compare0803DiLong_2017080311.dbo.syscolumns 
      where id=(
        select id from Catsic_Compare0803DiLong_2017080311.dbo.sysobjects 
        where name='t_cbjzc')
    ) T1 FULL OUTER JOIN(
      select name from Catsicgl_43_2016Eroad_2017111110.dbo.syscolumns 
      where id=(
        select id from Catsicgl_43_2016Eroad_2017111110.dbo.sysobjects 
        where name='t_cbjzc'
      )
    ) T2 on T1.name=T2.name

    where T1.name is null or T2.name is null

    https://www.cnblogs.com/dz-boss/p/7826477.html

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  • 原文地址:https://www.cnblogs.com/fuqiang88/p/11535729.html
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