Question

好的，我必须弄清楚如何只按部门向员工显示最高病假时间。如果一个部门有多名员工因病假而被捆绑，则必须向所有员工展示。

第一个查询，给我按SickLeaveHours排序的部门中的每个人。第二个查询按部门告诉我最高病假时间。

如何根据底部查询获取最高查询以限制结果。

Select FirstName + ' ' + LastName as Name, (SickLeaveHours), Department.DepartmentID as DepartmentID, HumanResources.Department.Name
 FROM HumanResources.Employee, HumanResources.EmployeeDepartmentHistory, Person.Contact, HumanResources.Department
Where Employee.EmployeeID=EmployeeDepartmentHistory.EmployeeID and Employee.ContactID=Contact.ContactID and EndDate is Null  and HumanResources.Department.DepartmentID=EmployeeDepartmentHistory.DepartmentID
Order by SickLeaveHours DESC


Select DepartmentID, Max(SickLeaveHours) as 'Top Sick Leave Hours'
From HumanResources.Employee, HumanResources.EmployeeDepartmentHistory
Where EmployeeDepartmentHistory.EmployeeID=Employee.EmployeeID and EmployeeDepartmentHistory.EndDate is Null
Group by DepartmentID
Order by 'Top Sick Leave Hours' DESC

Answer 1

一种方法是将您的底层查询保存到临时表中，并根据＆＃34; Top Sick Leave Hours＆＃34;取决于你正在做什么，可能不是最好的解决方案。

Answer 2

此窗口功能是否适合您？我没有你的环境来测试它，以确保我的语法完全正确...

Select FirstName + ' ' + LastName as Name, 
MAX(SickLeaveHours) OVER (PARTITION BY Department.DepartmentID ) as MaxSickLeaveHours,     
Department.DepartmentID as DepartmentID, HumanResources.Department.Name
 FROM HumanResources.Employee, HumanResources.EmployeeDepartmentHistory, Person.Contact, HumanResources.Department
Where Employee.EmployeeID=EmployeeDepartmentHistory.EmployeeID and Employee.ContactID=Contact.ContactID and EndDate is Null  and HumanResources.Department.DepartmentID=EmployeeDepartmentHistory.DepartmentID
Order by SickLeaveHours DESC

SQL组合语句

2 个答案: