SQL-基于2列和一个条件返回唯一行

HSQLDB支持相关子查询,因此我认为这将起作用:

select a.*
from accounts a
where a.id = (select a2.id
              from accounts a2
              where a2.account = a.account and a2.opendate = a.opendate
              order by baldate desc, id asc
              limit 1
             );

我不熟悉hslqdb,所以这只是ANSI。我发现它不支持分析功能,这会让生活更轻松。

如果可行的话,另一个答案是干净得多。

SELECT ACC_T1.Id,
       ACC_T1.Opendate,
       ACC_T1.Baldate
       ACC_T1.LastName,
       ...
       ACC_T1.State
  FROM Account_Table AS ACC_T1
 INNER
  JOIN (SELECT account,
               OpenDate,
               MAX(BalDate) AS m_BalDate
          FROM AccountTable
         GROUP
            BY account,
               OpenDate
       ) AS SB1
    ON ACC_T1.Account = SB1.Account
   AND ACC_T1.OpenDate = SB1.OpenDate
   AND ACC_T1.BalDate = SB1.m_BalDate
 INNER
  JOIN (SELECT account,
               OpenDate,
               BalDate,
               MIN(id) AS m_id
          FROM Account_Table
         GROUP
            BY account,
               OpenDate,
               BalDate
       ) AS SB2
    ON ACC_T1.Account = SB2.Account
   AND ACC_T1.OpenDate = SB2.OpenDate
   AND ACC_T1.BalDate = SB2.BalDate
   AND ACC_T1.id = SB2.m_id