实用技巧

--字符串表达是求值

WITH T AS
( SELECT '1+2+3+4' express FROM DUAL
   UNION ALL
   SELECT '21+2+32+4'  FROM DUAL
   UNION ALL
   SELECT '41+22+13+4' FROM DUAL
  )
SELECT dbms_aw.eval_number(express ) FROM T


--提取字段中的数字信息
select t20,translate(t20,'1234567890.'||t20,'1234567890.') as "保留数字"   from macc.lmf_1402 where t20 is not null 


length(translate(bill_id,'abcdefghijklmnopqrstuvwxyz.'||bill_id,'abcdefghijklmnopqrstuvwxyz.'))>0

--for update 引发 scn 值跳跃增长 bug 解决办法
select t.* , rowid from table_name t 
替代
select ...  for update 


--树
SELECT * FROM t_sys_dept where dept_status in (0,1)  START WITH dept_parent_id =10 CONNECT BY PRIOR  dept_id=dept_parent_id



--指定某个菜单下全部报表访问记清单
select b.menu_id,c.menu_name,a.rpt_id,d.rpt_name,a.view_oper_name,a.view_oper_date,a.view_ip
from mz_user.ls_rpt_view_log a,
     mz_user.ls_rpt_menu_link b,
     mz_user.t_sys_menu c,
     mz_user.ls_rpt_design d
where b.rpt_id=a.rpt_id(+)  
  and a.rpt_id=d.id   
  and b.menu_id=c.menu_id
  and c.menu_status=1
  and b.menu_id in (select menu_id FROM mz_user.t_sys_menu a
  START WITH menu_id=5000108431 CONNECT BY PRIOR  menu_id=menu_parent_id and menu_status=1)


--oracle 随即更新时间而且控制必定的范围
update t set timestamp=timestamp + to_number(to_date('20130701', 'YYYYMMDD') - trunc(to_date(to_char( timestamp,'YYYYMMDD'),'YYYYMMDD') - DBMS_RANDOM.VALUE(1,180),'DD'))

以上是更新时间控制在 201307-201312 期间


中位值
median(column)



--角色对应菜单矩阵

select distinct *from (
select role_name,
                 decode(count(distinct 县市业务统计)over(partition by role_name),1,'×',0,'×','√') 县市业务统计,
                 decode(count(distinct 登录日志 )over(partition by role_name),1,'×',0,'×','√') 登录日志 ,
                 decode(count(distinct 用户管理 )over(partition by role_name),1,'×',0,'×','√') 用户管理 ,
                 decode(count(distinct 角色管理 )over(partition by role_name),1,'×',0,'×','√') 角色管理 ,
                 decode(count(distinct 营业统计 )over(partition by role_name),1,'×',0,'×','√') 营业统计 ,
                 decode(count(distinct 业务统计 )over(partition by role_name),1,'×',0,'×','√') 业务统计 ,
                 decode(count(distinct 取号清单 )over(partition by role_name),1,'×',0,'×','√') 取号清单 ,
                 decode(count(distinct 营业窗口统计)over(partition by role_name),1,'×',0,'×','√') 营业窗口统计,
                 decode(count(distinct 营业业务统计)over(partition by role_name),1,'×',0,'×','√') 营业业务统计,
                 decode(count(distinct 部门管理 )over(partition by role_name),1,'×',0,'×','√') 部门管理 ,
                 decode(count(distinct 县市统计 )over(partition by role_name),1,'×',0,'×','√') 县市统计 ,
                 decode(count(distinct 营业时段统计)over(partition by role_name),1,'×',0,'×','√') 营业时段统计
                 
from (
select b.role_name,
case when a.menu_name = '县市业务统计' then '√' else '×' end as 县市业务统计,
case when a.menu_name = '登录日志' then '√' else '×' end as 登录日志 ,
case when a.menu_name = '用户管理' then '√' else '×' end as 用户管理 ,
case when a.menu_name = '角色管理' then '√' else '×' end as 角色管理 ,
case when a.menu_name = '营业统计' then '√' else '×' end as 营业统计 ,
case when a.menu_name = '业务统计' then '√' else '×' end as 业务统计 ,
case when a.menu_name = '取号清单' then '√' else '×' end as 取号清单 ,
case when a.menu_name = '营业窗口统计' then '√' else '×' end as 营业窗口统计,
case when a.menu_name = '营业业务统计' then '√' else '×' end as 营业业务统计,
case when a.menu_name = '部门管理' then '√' else '×' end as 部门管理 ,
case when a.menu_name = '县市统计' then '√' else '×' end as 县市统计 ,
case when a.menu_name = '营业时段统计' then '√' else '×' end as 营业时段统计
  from t_sys_role b,t_sys_menu a ,t_sys_role_menu c
where c.rm_menu_id = a.menu_id
and b.role_id = c.rm_role_id
group by b.role_name, a.menu_name))