//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
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