SQL 帮助，按另一个表分组

Question

select
  d.DepartmentId,
  d.Name,
  d.GroupName,
  eph.Rate * 40 * 52 * count(edh.EmployeeId) as AnnualPay
from
  HumanResources.Department d,
  HumanResources.EmployeePayHistory eph,
  HumanResources.Employee e,
  HumanResources.EmployeeDepartmentHistory edh
where
  e.CurrentFlag = 'True' and
  edh.DepartmentID = d.DepartmentID and
  edh.EmployeeID = eph.EmployeeID and
  e.EmployeeID = eph.EmployeeID
group by
  d.departmentID;

我们的目标是编写一份报告，以显示部门ID、姓名、组名在该部门工作的所有员工的年薪总额以及在该部门工作的员工人数。

要计算annual pay，请将每个员工的工资率乘以一年中 52 周的 40 小时。

仅包括所有员工年薪总额超过half a million dollars 的部门。

所有员工都应该是最新的（使用 currentflag）。

按员工年薪总额降序排列报表。

表格都包括在内，我不知道如何按部门分组...Database

Answer 1

如果我明白你在寻找什么，这应该可以：

SELECT 
    d.DepartmentId, 
    d.Name, 
    d.GroupName,
    SUM(eph.Rate * 40 * 52) as AnnualPay,
    Count(edh.EmployeeId) as EmployeeCount
from HumanResources.Department d 
JOIN HumanResources.EmployeeDepartmentHistory edh
ON edh.DepartmentID = d.DepartmentID
JOIN HumanResources.EmployeePayHistory eph
ON edh.EmployeeID = eph.EmployeeID
JOIN HumanResources.Employee e
ON e.EmployeeID = eph.EmployeeID
WHERE e.CurrentFlag = 'True' 
GROUP BY d.departmentID,d.Name,d.GroupName
HAVING AnnualPay > 500000
ORDER BY AnnualPay DESC;

Answer 2

请尝试以下...

SELECT DepartmentId AS DepartmentId,
       DepartmentName AS DepartmentName,
       DepartmentGroup AS DepartmentGroup,
       SUM( expectedAnnualPay ) AS TotalExpectedAnnualPay,
       COUNT( DepartmentId ) AS EmployeeCount
(
    SELECT Department.DepartmentId AS DepartmentId,
           Name AS DepartmentName,
           GroupName AS DepartmentGroup
           Rate *
               40 *
               52 AS expectedAnnualPay,
           EmployeeID AS EmployeeID
    FROM HumanResources.Department HRDepartment
    JOIN HumanResources.EmployeeDepartmentHistory HREmployeeDepartmentHistory ON HREmployeeDepartmentHistory.DepartmentID = HRDepartment.DepartmentID
    JOIN HumanResources.Employee HREmployee ON HREmployee.EmployeeID = HREmployeeDepartmentHistory.EmployeeID
    JOIN HumanResources.EmployeeDepartmentHistory HREmployeeDepartmentHistory ON HREmployee.EmployeeID = HREmployeePayHistory.EmployeeID
    WHERE HREmployee.CurrentFlag = 'True'
) departmentEmployee
GROUP BY DepartmentId
HAVING TotalExpectedAnnualPay > 500000
ORDER BY TotalExpectedAnnualPay DESC;

假设该部门内的所有现有员工都将留在该部门，您似乎要求提供该价值大于 500,000.00 美元的每个部门的总预期年薪金额列表以当前费率一年，并且在此期间不会添加任何员工。

我从以下查询（我给出了departmentEmployeeLevel 的别名）开始解决了这个问题...

SELECT Department.DepartmentId AS DepartmentId,
       Name AS DepartmentName,
       GroupName AS DepartmentGroup
       Rate *
           40 *
           52 AS expectedAnnualPay,
       EmployeeID AS EmployeeID
FROM HumanResources.Department HRDepartment
JOIN HumanResources.EmployeeDepartmentHistory HREmployeeDepartmentHistory ON HREmployeeDepartmentHistory.DepartmentID = HRDepartment.DepartmentID
JOIN HumanResources.Employee HREmployee ON HREmployee.EmployeeID = HREmployeeDepartmentHistory.EmployeeID
JOIN HumanResources.EmployeeDepartmentHistory HREmployeeDepartmentHistory ON HREmployee.EmployeeID = HREmployeePayHistory.EmployeeID
WHERE HREmployee.CurrentFlag = 'True'

此子查询返回每个部门的DepartmentId、部门Name 和GroupName，以及每个当前员工的EmployeeID 及其计算的预期年薪。

主查询使用子查询的结果将每个部门的结果聚合/组合在一起，并为每个部门计算预期年薪和员工人数的总和。然后，它使用HAVING 将列表细化为仅那些预期年工资成本大于 500,000.00 美元的部门，并按该字段对剩余记录进行排序。

如果您有任何问题或cmets，请随时发表评论。