mysql - 如何从mysql中的表中跳过行

Question

我有一个包含以下数据的表，我想跳过第 3 行，只想获取 OPEN 状态一次，我正在使用下面的查询，但它也跳过了第 5 行。

    SELECT t.*
FROM emailEvent t
  JOIN 
    ( SELECT MIN(id) AS minid
      FROM emailEvent WHERE email_id = 3
      GROUP BY status
    ) AS grp
    ON grp.minid = t.id
WHERE (t.email_id = 3)

我想出了这个作为解决方案，但不确定是否还有其他最佳解决方案

 SELECT t.*
FROM emailEvent t
WHERE t.status != "Open" and t.email_id = 3
UNION
(
SELECT et.*
FROM emailEvent et
WHERE et.status = "Open" and et.email_id = 3
ORDER BY et.createdAt DESC LIMIT 1
)

我希望结果看起来像这样

标签： mysqlsqlgroup-bysubquerydistinct

Answer 1

SELECT *
FROM
 (
   SELECT t.*, 
      min(id) over (partition by status) as min_id
   FROM emailEvent t
   WHERE (t.email_id = 3)   -- only email 3
 ) AS dt
WHERE id = min_id           -- only for 'Open' status
   OR status <> 'Open'

对于不支持Windowed Aggregates的旧版本：

select * 
from emailEvent
where email_id = 3
and 
  (
   e.status <> 'Open'
   or id in (select min(id)  -- only for 'Open' status
          from emailEvent 
          where status = 'Open'
          and email_id = 3)
  )