选择具有最大值的属性答案

【问题标题】：Select atribute with max value选择具有最大值的属性
【发布时间】：2021-03-29 20:34:52
【问题描述】：

如何使用子查询在 2 个日期之间选择具有最大雇主数的公司名称，主要问题是我有 2 个相同的日期和 2 个最大值，我只需要在子查询中取第一个

select Company.CompanyName from Company 
where FoundingDate between (select top (1) with ties FoundingDate
from Company order by FoundingDate desc) and '2020-11-30' 
group by Company.CompanyName

【问题讨论】：

样本数据和期望的结果会有所帮助。

标签： sql tsql select sql-order-by sql-limit

【解决方案1】：

select * from Company 
where FoundingDate between (select top (1) with ties FoundingDate
from Company order by FoundingDate desc) and '2020-11-30' 
group by Company.Id, Company.CompanyName, Company.DirectorName, Company.EmplCount,    Company.FoundingDate

select * from Company
where FoundingDate between (select max(FoundingDate) from Company where EmplCount = (select max(EmplCount) from Company)) and '2020-11-30'

2种答案

【讨论】：

【解决方案2】：

如果您每个创建日期只有一行，那么只需 order by 和 top：

select top (1) with ties FoundingDate, EmplCount
from Company 
order by EmplCount desc

如果您每个日期有不止一行，并且您想对相应的计数求和，那么您也需要聚合：

select top (1) with ties FoundingDate, sum(EmplCount) as sumEmplCount
from Company 
group by FoundingDate
order by sumEmplCount desc

【讨论】：

我为这个不完整的问题道歉，我想通过子查询select Company.CompanyName from Company where FoundingDate between (select top (1) with ties FoundingDate from Company order by FoundingDate desc) and '2020-11-30' group by Company.CompanyName
@SashaDrozdiuk：我不明白你的意思。如果上述查询没有达到您的要求，那么您可能希望edit your question 提供适当的样本数据和所需的结果，以阐明您的要求。