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//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  Oracle nullif函数的使用Fedora 12下安装Oracle 11客户端相关资讯      Oracle教程 
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