oracle sql

 0.删除重复的数据 没有主键的

delete from imp_comid a 

where a.idcard || '%'|| a.driverid in (

select a1 || '%'|| B1 from (

select t.idcard a1,min(driverid) b1 from imp_comid t group by t.idcard having count(*)>1)) 

      1.            update imp_stratwork t

   set t.class=1 ,t.guid = (select i.drivid

                    from imp_driv_id i

                   where i.drivname = t.drivname   and rownum<2)

2.oracle函数中有不足位数补空格的函数 

LPAD和RPAD分别是左补位和右补位 
repalce(lpad(字段名，共几位)，‘ ’，‘0’) 
如运行 
select replace(lpad('123',5),' ','0') from dual 
结果是00123 

即补足五位 

3. 去空格:update imp_mani m set m.taxiid= rtrim(m.taxiid) 

4.删除重复行 delete from imp_name t1 where rowid<(select max(rowid) from imp_name t2 where t1.name = t2.name)