A table of data backup and restore
creat table backup table select * from table where the original
insert into the original table select * from backup table
Second, using the backup table to restore the original field data table section
update 原表 t
set (age, idnumber) =
(select age, idnumber from 备份表 b where b.stuid = t.stuid)
where exists
(SELECT. 1 from the backup table b
where b.stuid = t.stuid
and b.stuname = '张三');
Three, , exp Export command ( run cmd )
1, export database
exp username / password @orcl file = d: \ daochu.dmp full = y
2, export table space
exp username / password @orcl File = d: \ daochu .dmp the Tablespaces = (testspace)
3. Export User
exp username / password @orcl File = D: \ daochu .dmp owner = (System, SYS)
4. Export Table
exp username / password @orcl File = d: \ daochu .dmp the Tables = table1, table2
Remark: buffer = 4096 (the size of the data buffer area designated) log = d: \ student.log (log storage path specified), for example:
Four, imp import command (run under cmd)
imp username / password @orcl file = d: /daochu.dmp full = y ignore = y
Note: sys user before importing data required to create a normal user, and create a new table space, empowerment.