数据库表间数据复制

数据库表间数据复制

      在利用数据库开发时，常常会将一些表之间的数据互相导入。当然可以编写程序实现，但是，程序常常需要开发环境，不方便。最方便是利用sql语言直接导入。既方便而修改也简单。以下就是导入的方法。

1。表结构相同的表，且在同一数据库（如，table1,table2)

Sql ：insert into table1 select * from table2 (完全复制)

           insert into table1 select distinct * from table2(不复制重复纪录）

          insert into table1 select top 5 * from table2 (前五条纪录)

2。   不在同一数据库中（如，db1 table1,db2 table2)

sql:    insert into db1..table1 select * from db2..table2 (完全复制)

           insert into db1..table1 select distinct * from db2table2(不复制重复纪录）

          insert into tdb1..able1 select top 5 * from   db2table2 (前五条纪录)

3.      表结构不同的表或复制部分纪录（如，dn_user,dn_user2)

a.    建一个新表[DN_UserTemp]（在老表dn_user上增加一列)

CREATE TABLE [DN_UserTemp] ( [Num] [numeric](18, 0) IDENTITY (1, 1) NOT NULL）
[Id] [idtype] NOT NULL ,
[Name] [fntype] NOT NULL ,
[Descript] [dstype] NULL ,
[LogonNm] [idtype] NOT NULL ,
[Password] [idtype] NULL ,
[Gender] [char] (1) NULL ,
[Quited] [booltype] NOT NULL,
[OffDuty] [booltype] NOT NULL ,
[Stopped] [booltype] NOT NULL,
[OSBind] [booltype] NOT NULL,
[Domain] [idtype] NULL ,
[EMail] [fntype] NULL ,
[UnitId] [idtype] NULL ,
[BranchId] [idtype] NULL ,
[DutyId] [idtype] NULL ,
[LevelId] [idtype] NULL ,
[ClassId] [idtype] NULL ,
[TypeId] [idtype] NULL ,
[IP] [varchar] (15) COLLATE Chinese_PRC_CI_AS NULL ,
[ExpireDT] [datetime] NULL ,
[Sort] [int] NOT NULL ,
[AllowDel] [booltype] NOT NULL,
[UnitChief] [booltype] NOT NULL,
[BranchChief] [booltype] NOT NULL ,
[UnitDeputy] [booltype] NOT NULL ,
[BranchDeputy] [booltype] NOT NULL ,
     
        [Num] [numeric](18, 0) IDENTITY (1, 1) NOT NULL

) ON [PRIMARY]

b. 将dn_uer2的数据拷入dn_usertemp

sql:insert into dn_usertemp select * from dn_user2

c.将dn_usertemp 拷入dn_user

sql:

declare @i int
declare @j int
declare @Name fntype
set @i=1
select @j=count(*) from dn_usertemp
while @i<@j 1
begin

select @Name=Name from dn_usertemp where Num=@i
print @Name
insert into dn_user (Name) values (@Name) where Num=@i
select @i=@i 1
end

---------------------------

creat到--

然后把数据库名改成想复制到的那个库的名称

 

精妙的SQL语句收藏

说明：复制表(只复制结构,源表名：a 新表名：b)
select * into b from a where 1<>1

说明：拷贝表(拷贝数据,源表名：a 目标表名：b)
insert into b(a, b, c) select d,e,f from b;
说明：日程安排提前五分钟提醒
select * from 日程安排 where datediff('minute',f开始时间,getdate())>5
说明：两张关联表，删除主表中已经在副表中没有的信息
delete from info where not exists ( select * from infobz where info.infid=infobz.infid )
说明：清除表中重复的记录(PriKey为递增值主键,key为判断相同记录的标准)
Delete From B Where B.PriKey In(Select B.PriKey from B As s1 Where B.PriKey not in (Select max(B.PriKey) from B As s2 Where s1.key=s2.key))