sql比較兩表

㈠ sql如何對比兩張表的數據

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為準的話，你最好在tableb上加個觸發器

㈡ 怎麼用sql語句把兩個表，兩個欄位進行比較

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語句怎麼判斷兩個表

用checksum校驗，比較兩張表裡的內容的checksum值是否一致

但是這種方法也只局限於兩表結構一摸一樣

我把[t1_new]表的數據復制到一張新的表以便進行比較

復制代碼
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中如何對比兩表之間的差異

創建表

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)

執行

selectleft(t.uid,2)開頭數字,count(*)數量
from
(select*fromtable2exceptselect*fromtable1)t
whereleft(t.uid,2)in('12','13')
groupbyleft(t.uid,2)

結果

㈤ 在SQL Server中如何比較兩個表的各組數據

假設兩個表都有唯一鍵UserID
可以這么寫(使用全連接【full outer join】：完整外部聯接返回左表和右表中的所有行。當某行在另一個表中沒有匹配行時，則另一個表的選擇列表列包含空值。如果表之間有匹配行，則整個結果集行包含基表的數據值。)

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比較兩張表的異同

*--比較兩個資料庫的表結構差異

--鄒建 2003.9(引用請保留此信息)--*/
/*--調用示例

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), --要比較的資料庫名1
@dbname2 varchar(250) --要比較的資料庫名2
as
create table #tb1(表名1 varchar(250),欄位名 varchar(250),序號 int,標識 bit,主鍵 bit,類型 varchar(250),
佔用位元組數 int,長度 int,小數位數 int,允許空 bit,默認值 varchar(500),欄位說明 varchar(500))

create table #tb2(表名2 varchar(250),欄位名 varchar(250),序號 int,標識 bit,主鍵 bit,類型 varchar(250),
佔用位元組數 int,長度 int,小數位數 int,允許空 bit,默認值 varchar(500),欄位說明 varchar(500))

--得到資料庫1的結構
exec('insert into #tb1 SELECT
表名=d.name,欄位名=a.name,序號=a.colid,
標識=case when a.status=0x80 then 1 else 0 end,
主鍵=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,
類型=b.name, 佔用位元組數=a.length,長度=a.prec,小數位數=a.scale, 允許空=a.isnullable,
默認值=isnull(e.text,''''''),欄位說明=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')

--得到資料庫2的結構
exec('insert into #tb2 SELECT
表名=d.name,欄位名=a.name,序號=a.colid,
標識=case when a.status=0x80 then 1 else 0 end,
主鍵=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,
類型=b.name, 佔用位元組數=a.length,長度=a.prec,小數位數=a.scale, 允許空=a.isnullable,
默認值=isnull(e.text,''''''),欄位說明=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 比較結果=case when a.表名1 is null and b.序號=1 then '庫1缺少表：'+b.表名2
when b.表名2 is null and a.序號=1 then '庫2缺少表:'+a.表名1
when a.欄位名 is null and exists(select 1 from #tb1 where 表名1=b.表名2) then '庫1 ['+b.表名2+'] 缺少欄位：'+b.欄位名
when b.欄位名 is null and exists(select 1 from #tb2 where 表名2=a.表名1) then '庫2 ['+a.表名1+'] 缺少欄位：'+a.欄位名
when a.標識<>b.標識 then '標識不同'
when a.主鍵<>b.主鍵 then '主鍵設置不同'
when a.類型<>b.類型 then '欄位類型不同'
when a.佔用位元組數<>b.佔用位元組數 then '佔用位元組數'
when a.長度<>b.長度 then '長度不同'
when a.小數位數<>b.小數位數 then '小數位數不同'
when a.允許空<>b.允許空 then '是否允許空不同'
when a.默認值<>b.默認值 then '默認值不同'
when a.欄位說明<>b.欄位說明 then '欄位說明不同'
else '' end,
*
from #tb1 a
full join #tb2 b on a.表名1=b.表名2 and a.欄位名=b.欄位名
where a.表名1 is null or a.欄位名 is null or b.表名2 is null or b.欄位名 is null
or a.標識<>b.標識 or a.主鍵<>b.主鍵 or a.類型<>b.類型
or a.佔用位元組數<>b.佔用位元組數 or a.長度<>b.長度 or a.小數位數<>b.小數位數
or a.允許空<>b.允許空 or a.默認值<>b.默認值 or a.欄位說明<>b.欄位說明
order by isnull(a.表名1,b.表名2),isnull(a.序號,b.序號)--isnull(a.欄位名,b.欄位名)
go

㈦ 如何用SQL語句對比2個表的數據

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select
base.name, base.year
, a.成績 as [a表成績]
, b.成績 as [b表成績]
, case
when a.成績 is null then 'a表中不存在'
when b.成績 is null then 'b表中不存在'
when a.成績=b.成績 then '成功'
else '差異' end as 比較結果
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