Question

截至此日期，最年长的人的名字是什么？包括他或她的年龄，人名，电话号码和头衔。注意：只显示最老的人的姓名。

我一直在尝试使用SQL Server回答这个问题，我不理解它。

这是我现在的代码：

Use AdventureWorks2014
Go

SELECT 
    p.FirstName, LastName, Title
    Employee_1, JobTitle, BirthDate
FROM 
    Person.Person AS p
INNER JOIN 
    HumanResources.Employee AS Employee_1 ON p.BusinessEntityID = Employee_1.BusinessEntityID 
WHERE
    Employee_1 BirthDate * (SELECT % BirthDate AS [age] 
                            FROM HumanResources.Employee))

Answer 1

最早的出生日期是什么？

SELECT MIN(BirthDate) FROM Person.Person

谁有这个生日？

SELECT p.FirstName, LastName, Title
   Employee_1, JobTitle, BirthDate
FROM Person.Person AS p 
WHERE P.birthdate = (SELECT MIN(BirthDate) FROM Person.Person)

他们的年龄是多少年？

SELECT p.FirstName, LastName, Title
   Employee_1, JobTitle, BirthDate,
   DATEDIFF(YEAR,BirthDate,GETDATE()) AS Age
FROM Person.Person AS p 
WHERE P.birthdate = (SELECT MIN(BirthDate) FROM Person.Person)

Answer 2

简单TOP查询应该适合您：

SELECT top 1 p.FirstName, LastName, Title
   Employee_1, JobTitle, BirthDate
FROM Person.Person AS p
INNER JOIN HumanResources.Employee AS Employee_1
ON p.BusinessEntityID = Employee_1.BusinessEntityID 
ORDER BY BirthDate

Answer 3

在AdventureWorks2014中，有两个表有生日...所以找到它们中最老的

 SELECT TOP 1 FirstName, LastName 
 FROM (
   SELECT FirstName, LastName, BirthDate
   FROM ProspectiveBuyer

   UNION ALL

   SELECT FirstName, LastName, BirthDate
   FROM DimEmployee
) AS all_people
ORDER BY BirthDate ASC

遇到SQL Server问题

3 个答案: