Sql 需要获取MAX中所选项目的ID

我有一个帐户（实体）列表，每个帐户有0:n个事件。（实体_事件）

在上面的查询中，我得到了所有事件，以及交易的最后完成日期，以及交易的总价值

我还需要的是上次支付交易的ID

我正在获取最大值（ee.event\u date）——但是有没有办法也获取实体\u事件的id？如果那天有不止一个活动，那么我想要最后一个

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或者此处是否需要子查询？

如果使用窗口函数而不是

分组依据

，则可以从记录中获取所有其他列。以下是查询的外观：

select t.*
from (Select e.id, e.description, 
             SUM(CASE WHEN ee.source_entity_id = e.id THEN 1 ELSE -1 END * ISNULL(ee.amount, 0)) OVER
                 (partition by e.id) AS Total, 
             MAX(ee.event_date) over (partition by e.id) AS LastTransactionDate,
             row_number() over (partition by e.id order by ee.event_date desc) as seqnum
      from entity e left join entity_event
           ee
           on ee.source_entity_id = e.id or ee.destination_entity_id = e.id
      where e.deleted is NULL and e.portfolio_id = 79 and e.entity_type_id = 1
     ) t
where seqnum = 1;
order by e.description;

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完美的现在，我们来看看为什么会这样！从未在没有组的情况下使用计数/总和/最大值。现在需要阅读“窗口功能”。谢谢

select t.*
from (Select e.id, e.description, 
             SUM(CASE WHEN ee.source_entity_id = e.id THEN 1 ELSE -1 END * ISNULL(ee.amount, 0)) OVER
                 (partition by e.id) AS Total, 
             MAX(ee.event_date) over (partition by e.id) AS LastTransactionDate,
             row_number() over (partition by e.id order by ee.event_date desc) as seqnum
      from entity e left join entity_event
           ee
           on ee.source_entity_id = e.id or ee.destination_entity_id = e.id
      where e.deleted is NULL and e.portfolio_id = 79 and e.entity_type_id = 1
     ) t
where seqnum = 1;
order by e.description;