Question

我试图只选择最近的calldatetime并在我的结果中显示，有人可以帮忙吗？我需要结果只显示最新的更新记录

SELECT
    ROW_NUMBER() OVER (PARTITION BY l.phonenum ORDER BY h.calldatetime) as rn,
    h.HistoryID,
    l.ProjectID,
    h.ProjName,
    l.CompanyName,
    l.Phonenum,
    l.fname,
    l.lname,
    l.Address1,
    l.Address2,
    l.Address3,
    l.Town,
    l.Postcode,
    l.county,
    h.CallDateTime,
    cb.CBDatetime,
    l.apptdate,
    l.appttime,
    h.CRC,
    c.Description,
    a.Firstname + ' ' + a.Lastname AS AgentName,
    l.Notes
FROM
    History h inner join
    cmp_UtilityTrade l on h.PhoneNum = l.Phonenum left outer join
    CRC c on c.CRC = h.CRC left outer join
    Agent a on a.AgentID = h.AgentID left outer join
    CallBack cb on cb.DialID = h.DialID
WHERE
    h.calldatetime BETWEEN '2016-05-01 00:00:00' AND '2016-06-15 23:00:00'
ORDER BY
    l.Phonenum

Answer 1

看起来您已经按照您需要的方式设置了row_number() over窗口功能。假设它返回正确的值，您只需要按rn值过滤结果。只需将现有查询放在CTE中，并按如下方式过滤结果：

with cte as (<your_query_without_order_by_phonenum>)
select *
  from cte
 where rn = 1
 order by phonenum

另请注意，您可能希望将order by l.Phonenum子句移到CTE之外，并将其放在外部查询中。

修改

如评论中所述，您可能还必须将order by窗口函数中的row_number()子句修复为h.calldatetime DESC。

仅选择最近的记录（calldatetime）SQL

1 个答案: