如何在报表生成器中根据 MAX 日期显示不同的值？答案

【问题标题】：How to display distinct values based on MAX date in report builder?如何在报表生成器中根据 MAX 日期显示不同的值？
【发布时间】：2017-09-17 11:49:36
【问题描述】：

我对 SQL 很陌生，希望您能帮助我。我正在尝试根据选择特定用户的最新日期从我的表中检索唯一值。

这是数据：

Raw Data

这就是我想要实现的目标：

Desired Data

我尝试编写 2 个查询，但不幸的是：

我的第一个查询将显示每个公司的重复行：

SELECT DISTINCT FilteredAppointment.regardingobjectidname ,FilteredAppointment.owneridname ,FilteredAppointment.subject ,MAX(FilteredAppointment.scheduledstart) as Date ,FilteredAppointment.location ,FilteredCcx_member.ccx_mnemonic FROM FilteredAppointment INNER JOIN FilteredAccount ON FilteredAppointment.regardingobjectid = FilteredAccount.accountid INNER JOIN FilteredCcx_member ON FilteredAccount.accountid = FilteredCcx_member.ccx_accountid WHERE FilteredAppointment.statecodename != N'Canceled' AND FilteredAppointment.owneridname IN (N'User1', N'User2', N'User3') GROUP BY FilteredAppointment.regardingobjectidname ,FilteredAppointment.owneridname ,FilteredAppointment.subject ,FilteredAppointment.scheduledstart ,FilteredAppointment.location ,FilteredCcx_member.ccx_mnemonic ORDER BY FilteredAppointment.regardingobjectidname

我的第二个查询将只显示一行：

SELECT DISTINCT FilteredAppointment.regardingobjectidname ,FilteredAppointment.owneridname ,FilteredAppointment.subject ,FilteredAppointment.scheduledstart ,FilteredAppointment.location ,FilteredCcx_member.ccx_mnemonic FROM FilteredAppointment INNER JOIN FilteredAccount ON FilteredAppointment.regardingobjectid = FilteredAccount.accountid INNER JOIN FilteredCcx_member ON FilteredAccount.accountid = FilteredCcx_member.ccx_accountid WHERE FilteredAppointment.scheduledstart = (SELECT MAX(FilteredAppointment.scheduledstart) FROM FilteredAppointment WHERE FilteredAppointment.regardingobjectidname = FilteredAppointment.regardingobjectidname) AND  FilteredAppointment.statecodename != N'Canceled' AND FilteredAppointment.owneridname IN (N'User1', N'User2', N'User3') GROUP BY FilteredAppointment.regardingobjectidname ,FilteredAppointment.owneridname ,FilteredAppointment.subject ,FilteredAppointment.scheduledstart ,FilteredAppointment.location ,FilteredCcx_member.ccx_mnemonic ORDER BY FilteredAppointment.regardingobjectidname

【问题讨论】：

标签： sql group-by reportbuilder3.0 distinct-values maxdate

【解决方案1】：

试试这个：-

 SELECT distinct a.date, a.company, a.companyID, a.User,  a.Location, a.topic
    FROM tablename a
    inner join
    (
    Select company, companyID, User, max(date) as recent_date
    from
    tablename 
    group by company, companyID, User
    ) b
    on a.date=b.recent_date and a.company=b.company and a.companyID=b.companyID
    and a.User=b.User;

【讨论】：

您好，非常感谢您的回复，非常感谢！就像我说的，我是 SQL 新手——还在学习。它告诉我公司 ID 的列无效。我必须使用公司和公司 ID 加入

【解决方案2】：

我设法解决了这个问题 - 再次感谢您的帮助！

WITH apptmts AS (SELECT TOP 1 WITH TIES fa.scheduledstart,fa.location,fa.regardingobjectidname,mem.ccx_mnemonic,fa.owneridname,fa.subject FROM FilteredAppointment fa JOIN FilteredAccount acc on fa.regardingobjectid = acc.accountid JOIN FilteredCcx_member mem ON acc.accountid = mem.ccx_accountid WHERE fa.statecodename != N'Canceled' AND fa.owneridname IN (N'User1', N'User2', N'User3') ORDER BY ROW_NUMBER() OVER(PARTITION BY fa.regardingobjectidname ORDER BY fa.scheduledstart DESC) ) SELECT * FROM apptmts ORDER BY scheduledstart DESC

【讨论】：