oracle_查询优化in改造

数据查询大意为查询历史操作记录汇总的出去某部门之外的创建记录。

原sql中使用方法递归查询方法，耗时较慢继而进行优化。

select 
count(1)
from aa bd,bb d
where 1=1
and bd.id=d.b_id 
and bd.j in 
  (
    select distinct th.j from dd th  where  where 1 =1 
    and p=p  and th.j = bd.j
    and trunc(th.date) >= trunc(to_date('2019-05-17','yyyy-mm-dd')-6)
    and trunc(th.date) <= trunc(to_date('2019-05-17','yyyy-mm-dd'))
)
and f_dept_name(bd.created_by) <> ${dName};

  数据耗时：  

 

 

select 
count(1)
from aa bd,bb d
,(select ','||wm_concat(wd.id)||',' ids  from cc wd start with wd.id = ${dId} connect by prior wd.id = wd.p_id )c 
where 1=1
and bd.id=d.b_id 
and exists(
    select th.j from dd th  where 1 =1 
    and p=p  and th.j = bd.j
    and trunc(th.date) >= trunc(to_date('2019-05-17','yyyy-mm-dd')-6)
    and trunc(th.date) <= trunc(to_date('2019-05-17','yyyy-mm-dd'))
)
and instr(c.ids,','||F_DEPT_ID(bd.cb)||',') = 0 ; 

数据查询耗时：