Oracle中的exists的用法

一、用法和解释

select * from inaj_b
where inaj_b.inaj035 = 'aint302'  
   and inaj_b.inaj022 = to_date('20171231', 'YYMMDD')
    and not exists        
        (select 1 from inaj_t
                 where inaj_b.inaj001 = inaj_t.inaj001
                   and inaj_b.inaj002 = inaj_t.inaj002
                   and inaj_b.inaj003 = inaj_t.inaj003)

上述语句中not exists 后面的select 1 from 查找出inaj_t和inaj_b的数据交集的数据。整个语句的意思就是数据存在inaj_t，不存在inaj_b中。