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:

1 select name 
2 
3   from Catsic_Compare0803DiLong_2017080311.dbo.syscolumns  
4 
5   where id=(
6 
7     select id from Catsic_Compare0803DiLong_2017080311.dbo.sysobjects  where name='t_cbjzc'
8 
9   )

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:

 1 select * from (
 2   select name 
 3   from Catsic_Compare0803DiLong_2017080311.dbo.syscolumns 
 4   where id=(
 5     select id from Catsic_Compare0803DiLong_2017080311.dbo.sysobjects 
 6     where name='t_cbjzc')
 7 ) T1 FULL OUTER JOIN(
 8   select name from Catsicgl_43_2016Eroad_2017111110.dbo.syscolumns 
 9   where id=(
10     select id from Catsicgl_43_2016Eroad_2017111110.dbo.sysobjects 
11     where name='t_cbjzc'
12   )
13 ) 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:

 1 select * from (
 2   select name 
 3   from Catsic_Compare0803DiLong_2017080311.dbo.syscolumns 
 4   where id=(
 5     select id from Catsic_Compare0803DiLong_2017080311.dbo.sysobjects 
 6     where name='t_cbjzc')
 7 ) T1 FULL OUTER JOIN(
 8   select name from Catsicgl_43_2016Eroad_2017111110.dbo.syscolumns 
 9   where id=(
10     select id from Catsicgl_43_2016Eroad_2017111110.dbo.sysobjects 
11     where name='t_cbjzc'
12   )
13 ) T2 on T1.name=T2.name
14 
15 where T1.name is null or T2.name is null

 

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