查询根据特定条件过滤记录

Question

  

有一个表a_status_check，其中包含以下数据：

要求是：如果状态LC和BE都存在，则仅考虑LC。否则，考虑BE。忽略该ID的其他代码。

所以，结果应该是：

我尝试了DECODE和CASE功能而没有运气。有人可以帮忙。

Answer 1

使用分析功能：

select distinct
  id,
  first_value (status) over (partition by id order by status desc) status,
  first_value (amt   ) over (partition by id order by status desc) amt
from
  tq84_a_status_check
where
  status in ('LC', 'BE')
order by
  id;

TESTDATA：

create table tq84_a_status_check (
  id number,
  status varchar2(10),
  amt number
);

select distinct
  id,
  first_value (status) over (partition by id order by status desc) status,
  first_value (amt   ) over (partition by id order by status desc) amt
from
  tq84_a_status_check
where
  status in ('LC', 'BE')
order by
  id;

Answer 2

你可以试试这个：

SELECT id, status, amt
FROM yourTable yt
INNER JOIN (
        -- get only max
        SELECT id, MAX(status) as status
        FROM yourTable
        GROUP BY id
    ) as onlyMax
      ON yt.id = onlyMax.id
      AND yt.status = onlyMax.status

Answer 3

假设您只有两个STATUS值（A和B），此解决方案应该可以正常工作。我首先获得一个临时表，其中包含每个STATUS的{​​{1}}个计数，然后我ID将其返回JOIN。 a_status_check子句在单独显示时会保留WHERE个记录，并在A和B一起显示时保留A条记录。

B

Answer 4

试试这个

SELECT id, status, amt
FROM a_status_check t
INNER JOIN (
        SELECT id, MAX(status) as status
        FROM a_status_check
        GROUP BY id
    ) as a
      ON t.id = a.id
      AND t.status = a.status