Sql 根据两列中的值选择行

这是我的桌子

 ID  prod   Num 
-------------------
| 1 | A  |  4
| 1 | B  |  3
| 1 | K  |  2
| 2 | A  |  4
| 2 | B  |  4
| 2 | C  |  2
| 3 | A  |  1
| 3 | K  |  4

首先，我需要Num=4的所有行，并且对于同一个ID存在Prod=K

结果1应该是

ID  prod   num 
-------------------
| 1 | A  |  4
| 1 | B  |  3
| 1 | K  |  2
| 3 | A  |  1
| 3 | K  |  4

我还需要另一个只有行的结果：Num=4或Prod=K 从第一个查询开始

结果2：

ID  prod   num 
-------------------
| 1 | A  |  4
| 1 | K  |  2
| 3 | A  |  1
| 3 | K  |  4

with res1 as (select t.id,t.prod,t.num
from mytable t 
join
(select distinct id
from mytable x
where num = 4
and exists(select 1 from mytable where id = x.id and prod = 'K') ) x
on t.id = x.id
)
select * from res1 where num = 4 or prod = 'K'

谢谢大家。

结果1：

select t.id,t.prod,t.num
from mytable t 
join
(select distinct id
from mytable x
where num = 4
and exists(select 1 from mytable where id = x.id and prod = 'K') ) x
on t.id = x.id

结果2：

ID  prod   num 
-------------------
| 1 | A  |  4
| 1 | K  |  2
| 3 | A  |  1
| 3 | K  |  4

with res1 as (select t.id,t.prod,t.num
from mytable t 
join
(select distinct id
from mytable x
where num = 4
and exists(select 1 from mytable where id = x.id and prod = 'K') ) x
on t.id = x.id
)
select * from res1 where num = 4 or prod = 'K'

你可以试试这个

---

您可以使用以下查询：

SELECT ID
FROM mytable
WHERE Num = 4 OR Prod = 'K'
GROUP BY ID
HAVING COUNT(CASE WHEN Prod = 'K' THEN 1 END) <> 0 
       AND COUNT(CASE WHEN Num = 4 THEN 1 END) <> 0

要获得结果集2，只需将

Num=4或Prod='K'

谓词添加到上述查询的

WHERE

子句中

对于第一个查询：

SELECT t.* FROM table t
LEFT OUTER JOIN table t2 ON t2.id = t.id AND t2.num=4
LEFT OUTER JOIN table t3 ON t3.id =t.id AND t3.prod='K'
WHERE t2.id IS NOT NULL AND t3.id IS NOT NULL
ORDER BY t.id,t.prod

第二个问题：

SELECT t.* FROM table t
LEFT OUTER JOIN table t2 ON t2.id = t.id AND t2.num=4
LEFT OUTER JOIN table t3 ON t3.id =t.id AND t3.prod='K'
WHERE t2.id IS NOT NULL AND t3.id IS NOT NULL
AND (t.num=4 OR t.prod='K')
ORDER BY t.id,t.prod

---

结果2似乎与给定的搜索条件不一致，特别是记录

（3，'A'，1）

。由于我之前误解了问题，编辑了我的答案。