Question

我希望employee numbers和start dates的所有员工start dates等于最早的日期。

我知道这是错的。但只是写作来展示我想要的东西。

SELECT     start_date, employee_no
FROM         [employees]
WHERE     (start_date = MIN(start_date))

Answer 1

你很亲密！

SELECT     start_date, employee_no
FROM         [employees]
WHERE     start_date = (SELECT MIN(start_date) FROM employees)

Answer 2

我会使用通用表达式表（CTE）来执行此操作。这就像创建一个临时表。

;with EmpInfo as 
(
    SELECT start_date, employee_no, MIN(start_date) OVER () as MinStartDate
    FROM [employees]
)
SELECT start_date, employee_no FROM EmpInfo WHERE start_date = MinStartDate

这是关于Using Common Table Expressions

的Microsoft网页

Answer 3

这样做：

SELECT     start_date, employee_no 
FROM         [employees] 
WHERE     start_date = (select MIN(start_date) from [employees])

Answer 4

SELECT    start_date, employee_no
FROM      [employees]
WHERE     start_date = (SELECT MIN(start_date) FROM [employees])

如何制定这个SQL查询？

4 个答案: