//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