当两个字段满足 OR 条件时从表中选择。如果他们在相同字段上满足 AND 条件，则选择日期较早的字段答案

【问题标题】：Selecting from table when two fields satisfy OR condition. And if they satisfy AND condition on same fields select the ones with early date当两个字段满足 OR 条件时从表中选择。如果他们在相同字段上满足 AND 条件，则选择日期较早的字段
【发布时间】：2017-03-29 16:43:18
【问题描述】：

ID1 ID2 DATE INITIAL FINAL
20 328 2016/11/08 01 01
21 328 2016/11/11 01 01
53 766 2016/09/26 00 01
39 766 2016/11/25 01 00

每个 ID2 有两个条目

在上面的示例中，我想选择 INITIAL = 01 or FINAL = 01 的记录，但同时也选择 INITIAL = 01 和 FINAL = 01 的相同 ID2 的记录，我想要选择日期较早的那个

我正在寻找一个看起来像这样的最终集

ID1 ID2 DATE INITIAL FINAL
20 328 2016/11/08 01 01
53 766 2016/09/26 00 01
39 766 2016/11/25 01 00

【问题讨论】：

标签： sql oracle select join

【解决方案1】：

将您的 2 个案例视为单独的查询，然后将它们合并。 WITH 只是我构建虚拟数据。这不会解决 id2 具有 01 初始和 01 最终以及另一行具有 00 和 01 的情况 --- 但这不在您的要求中。如果您有两个 01 01 行的相同 id2 具有相同的最小日期，它也不会解决这个问题，但同样 - 这不在规范中；我只是想把这些事情说得透彻。

with records as
  (select 20 as id1, 328 as id2, to_date('2016-11-08','YYYY-MM-DD') as mydate, '01' as myinitial, '01' as myfinal from dual
   union all
   select 21 as id1, 328 as id2, to_date('2016-11-11','YYYY-MM-DD') as mydate, '01' as myinitial, '01' as myfinal from dual
   union all
   select 53 as id1, 766 as id2, to_date('2016-09-26','YYYY-MM-DD') as mydate, '00' as myinitial, '01' as myfinal from dual
   union all
   select 39 as id1, 766 as id2, to_date('2016-11-25','YYYY-MM-DD') as mydate, '01' as myinitial, '00' as myfinal from dual)

select *
from records
where (myinitial = '01' or myfinal = '01')
  and myinitial <> myfinal

union 

select *
  from records  r
  where r.myinitial = '01' and r.myfinal = '01'
    and r.mydate =
        (select min(r2.mydate) from records r2
           where r2.myinitial='01' and r2.myfinal='01' and r2.id2 = r.id2)
  ;

【讨论】：

【解决方案2】：

在本例中，“OR”包括“AND”

试试看

select * from (select  * from myTable where INITIAL = '01' or FINAL = '01' order by Date) where Rownum=1

【讨论】：

【解决方案3】：

试试下面的查询。它将丢弃 INITIAL=00 和 FINAL=00 的行，因为您只想选择 INITIAL = 01 或 FINAL = 01 AND INITIAL = 01 AND FINAL = 01 且日期较早的记录

SELECT ID1,ID2,DATE,INITIAL,FINAL FROM TEST1 WHERE ID1 NOT IN(SELECT ID1 FROM
(SELECT ID1,
  ID2,
  DATE,
  INITIAL,
  FINAL,
  RANK() OVER (PARTITION BY ID2 ORDER BY DATE) rn
FROM TEST1
WHERE (INITIAL = '01'
AND FINAL    = '01')
) WHERE rn>1  ) AND (INITIAL != '00'OR FINAL!= '00');

【讨论】：