sql比较两表

㈠ sql如何对比两张表的数据

insert
into
tablea
select
*
from
tablea
where
not
exists
(selelct
'1'
from
tableb
where
tablea.serverid
=
serverid
and
tablea.driverid
=
driverid
and
tablea.driversize
=
driversize)
update
tablea
set
tablea.driversize
=
tablea.driversize
from
tablea
,tableb
where
tablea.serverid
=
serverid
and
tablea.driverid
=
driverid
如果你以tableb为准的话，你最好在tableb上加个触发器

㈡ 怎么用sql语句把两个表，两个字段进行比较

select y.F,x.B from 表1 x left join 表2 y on x.A=y.E order by x.B

㈢ SQL语句怎么判断两个表

用checksum校验，比较两张表里的内容的checksum值是否一致

但是这种方法也只局限于两表结构一摸一样

我把[t1_new]表的数据复制到一张新的表以便进行比较

复制代码
SELECT * FROM [dbo].[t1_new]
SELECT * FROM [dbo].[t1_newreplica]

SELECT SUM(CHECKSUM(*)) AS checksumvalue FROM [dbo].[t1_old]
SELECT SUM(CHECKSUM(*)) AS checksumvalue FROM [dbo].[t1_new]
SELECT SUM(CHECKSUM(*)) AS checksumvalue FROM [dbo].[t1_newreplica]

㈣ SQL中如何对比两表之间的差异

创建表

createtabletable1
(idint,
uidvarchar(10))

insertintotable1values(1,12)
insertintotable1values(2,1234)
insertintotable1values(3,1245)
insertintotable1values(4,1356)
insertintotable1values(5,13)
insertintotable1values(6,133478)

createtabletable2
(idint,
uidvarchar(10))

insertintotable2values(1,12)
insertintotable2values(2,1234)
insertintotable2values(3,1245)
insertintotable2values(4,1356)
insertintotable2values(5,13)
insertintotable2values(6,133478)
insertintotable2values(7,12345)
insertintotable2values(8,13455)
insertintotable2values(9,13558)

执行

selectleft(t.uid,2)开头数字,count(*)数量
from
(select*fromtable2exceptselect*fromtable1)t
whereleft(t.uid,2)in('12','13')
groupbyleft(t.uid,2)

结果

㈤ 在SQL Server中如何比较两个表的各组数据

假设两个表都有唯一键UserID
可以这么写(使用全连接【full outer join】：完整外部联接返回左表和右表中的所有行。当某行在另一个表中没有匹配行时，则另一个表的选择列表列包含空值。如果表之间有匹配行，则整个结果集行包含基表的数据值。)

select *from RCSA_UserInfoDEL a full outer join RCSA_UserInfo b on a.UserID=b.UserIDwhere a.UserID is null or b.UserID is null

㈥ SQL比较两张表的异同

*--比较两个数据库的表结构差异

--邹建 2003.9(引用请保留此信息)--*/
/*--调用示例

exec p_comparestructure 'xzkh_model','xzkh_new'
--*/

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[p_comparestructure]') and OBJECTPROPERTY(id, N'IsProcere') = 1)
drop procere [dbo].[p_comparestructure]
GO

create proc p_comparestructure
@dbname1 varchar(250), --要比较的数据库名1
@dbname2 varchar(250) --要比较的数据库名2
as
create table #tb1(表名1 varchar(250),字段名 varchar(250),序号 int,标识 bit,主键 bit,类型 varchar(250),
占用字节数 int,长度 int,小数位数 int,允许空 bit,默认值 varchar(500),字段说明 varchar(500))

create table #tb2(表名2 varchar(250),字段名 varchar(250),序号 int,标识 bit,主键 bit,类型 varchar(250),
占用字节数 int,长度 int,小数位数 int,允许空 bit,默认值 varchar(500),字段说明 varchar(500))

--得到数据库1的结构
exec('insert into #tb1 SELECT
表名=d.name,字段名=a.name,序号=a.colid,
标识=case when a.status=0x80 then 1 else 0 end,
主键=case when exists(SELECT 1 FROM '+@dbname1+'..sysobjects where xtype=''PK'' and name in (
SELECT name FROM '+@dbname1+'..sysindexes WHERE indid in(
SELECT indid FROM '+@dbname1+'..sysindexkeys WHERE id = a.id AND colid=a.colid
))) then 1 else 0 end,
类型=b.name, 占用字节数=a.length,长度=a.prec,小数位数=a.scale, 允许空=a.isnullable,
默认值=isnull(e.text,''''''),字段说明=isnull(g.[value],'''''')
FROM '+@dbname1+'..syscolumns a
left join '+@dbname1+'..systypes b on a.xtype=b.xusertype
inner join '+@dbname1+'..sysobjects d on a.id=d.id and d.xtype=''U'' and d.name<>''dtproperties''
left join '+@dbname1+'..syscomments e on a.cdefault=e.id
left join '+@dbname1+'..sysproperties g on a.id=g.id and a.colid=g.smallid
order by a.id,a.colorder')

--得到数据库2的结构
exec('insert into #tb2 SELECT
表名=d.name,字段名=a.name,序号=a.colid,
标识=case when a.status=0x80 then 1 else 0 end,
主键=case when exists(SELECT 1 FROM '+@dbname2+'..sysobjects where xtype=''PK'' and name in (
SELECT name FROM '+@dbname2+'..sysindexes WHERE indid in(
SELECT indid FROM '+@dbname2+'..sysindexkeys WHERE id = a.id AND colid=a.colid
))) then 1 else 0 end,
类型=b.name, 占用字节数=a.length,长度=a.prec,小数位数=a.scale, 允许空=a.isnullable,
默认值=isnull(e.text,''''''),字段说明=isnull(g.[value],'''''')
FROM '+@dbname2+'..syscolumns a
left join '+@dbname2+'..systypes b on a.xtype=b.xusertype
inner join '+@dbname2+'..sysobjects d on a.id=d.id and d.xtype=''U'' and d.name<>''dtproperties''
left join '+@dbname2+'..syscomments e on a.cdefault=e.id
left join '+@dbname2+'..sysproperties g on a.id=g.id and a.colid=g.smallid
order by a.id,a.colorder')
--and not exists(select 1 from #tb2 where 表名2=a.表名1)
select 比较结果=case when a.表名1 is null and b.序号=1 then '库1缺少表：'+b.表名2
when b.表名2 is null and a.序号=1 then '库2缺少表:'+a.表名1
when a.字段名 is null and exists(select 1 from #tb1 where 表名1=b.表名2) then '库1 ['+b.表名2+'] 缺少字段：'+b.字段名
when b.字段名 is null and exists(select 1 from #tb2 where 表名2=a.表名1) then '库2 ['+a.表名1+'] 缺少字段：'+a.字段名
when a.标识<>b.标识 then '标识不同'
when a.主键<>b.主键 then '主键设置不同'
when a.类型<>b.类型 then '字段类型不同'
when a.占用字节数<>b.占用字节数 then '占用字节数'
when a.长度<>b.长度 then '长度不同'
when a.小数位数<>b.小数位数 then '小数位数不同'
when a.允许空<>b.允许空 then '是否允许空不同'
when a.默认值<>b.默认值 then '默认值不同'
when a.字段说明<>b.字段说明 then '字段说明不同'
else '' end,
*
from #tb1 a
full join #tb2 b on a.表名1=b.表名2 and a.字段名=b.字段名
where a.表名1 is null or a.字段名 is null or b.表名2 is null or b.字段名 is null
or a.标识<>b.标识 or a.主键<>b.主键 or a.类型<>b.类型
or a.占用字节数<>b.占用字节数 or a.长度<>b.长度 or a.小数位数<>b.小数位数
or a.允许空<>b.允许空 or a.默认值<>b.默认值 or a.字段说明<>b.字段说明
order by isnull(a.表名1,b.表名2),isnull(a.序号,b.序号)--isnull(a.字段名,b.字段名)
go

㈦ 如何用SQL语句对比2个表的数据

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select
base.name, base.year
, a.成绩 as [a表成绩]
, b.成绩 as [b表成绩]
, case
when a.成绩 is null then 'a表中不存在'
when b.成绩 is null then 'b表中不存在'
when a.成绩=b.成绩 then '成功'
else '差异' end as 比较结果
from (
select name, year from tb_a
union
select name, year from tb_b
) as base
left join tb_a as a on a.name=base.name and a.year=base.year
left join tb_b as b on b.name=base.name and b.year=base.year