SQL Server故障

Question

截至此日期，最老的人的姓名是什麼？包括他或她的年齡，人名，電話號碼和頭銜。注意：只顯示最老的人的名字。

我一直在嘗試使用SQL Server來回答這個問題，我不理解它。

這是我現在所擁有的代碼：

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

什麼是最早的生日？

SELECT MIN(BirthDate) FROM Person.Person 

誰有這個出生日期？

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

他們的年齡是多少歲？

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

簡單TOP查詢應爲你工作：

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有有生日兩個表......於是找到的最古老的他們兩人的

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