//需求：  
//查询出用户在没有出差的时候录入的信息  
//分析：  
//子查询：我们可以显查询出那些在出差时录入信息的用户id，和时间  
//主查询：我们从用户明细表中检索信息，条件是，用户id和write_date不在子查询查到的id和时间  
//  
//用户明细表  
with tmp_a as(  
     select 1 id,to_date('20100405','yyyymmdd') write_date,'tttttt1'  text from dual union all  
     select 1,to_date('20100406','yyyymmdd'),'tttttt2' from dual union all  
     select 1,to_date('20100407','yyyymmdd'),'tttttt3' from dual union all  
     select 1,to_date('20100408','yyyymmdd'),'tttttt4' from dual union all  
     select 1,to_date('20100409','yyyymmdd'),'tttttt5' from dual union all  
     select 1,to_date('20100410','yyyymmdd'),'tttttt6' from dual union all  
     select 1,to_date('20100411','yyyymmdd'),'tttttt7' from dual union all  
     select 1,to_date('20100412','yyyymmdd'),'tttttt8' from dual union all  
     select 1,to_date('20100413','yyyymmdd'),'tttttt9' from dual union all  
     select 1,to_date('20100414','yyyymmdd'),'tttttt10' from dual union all  
     select 2,to_date('20100405','yyyymmdd'),'ssssss1' from dual union all  
     select 2,to_date('20100406','yyyymmdd'),'ssssss2' from dual union all  
     select 2,to_date('20100407','yyyymmdd'),'ssssss3' from dual union all  
     select 2,to_date('20100408','yyyymmdd'),'ssssss4' from dual union all  
     select 2,to_date('20100409','yyyymmdd'),'ssssss5' from dual union all  
     select 2,to_date('20100410','yyyymmdd'),'ssssss6' from dual union all  
     select 2,to_date('20100411','yyyymmdd'),'ssssss7' from dual)  
//出差记录表  
,tmp_b as(  
       select 1 id,to_date('20100407','yyyymmdd') begin_dt,to_date('20100409','yyyymmdd') end_dt from dual union all  
       select 1,to_date('20100411','yyyymmdd'),to_date('20100412','yyyymmdd') from dual union all  
       select 2,to_date('20100408','yyyymmdd'),to_date('20100410','yyyymmdd') from dual)  
//查询 SQL  
//需要解决的问题  
//1. 同一用户，间隔出差（存在不同的出差启始时间） 不可简单使用 not between  
//2. 有些用户，可能没有出差记录                   不可简单使用 a.id = b.id  
//通过过滤 (NOT IN) 查询出不存在出差记录的用户明细  
select s.id,s.write_date,s.text  
from tmp_a s  
where (s.id,s.write_date) not in 
      (//存在出差记录的用户明细  
       select distinct a.id,a.write_date  
       from tmp_a a inner join tmp_b b   
            on a.id = b.id   
       where a.write_date   
             between b.begin_dt and b.end_dt  
       )  
        ID WRITE_DATE  TEXT  
---------- ----------- --------  
         1 2010-04-05  tttttt1  
         1 2010-04-06  tttttt2  
         1 2010-04-10  tttttt6  
         1 2010-04-13  tttttt9  
         1 2010-04-14  tttttt10  
         2 2010-04-05  ssssss1  
         2 2010-04-06  ssssss2  
         2 2010-04-07  ssssss3  
         2 2010-04-11  ssssss7 

您可能感兴趣的文章: