我如何與員工ID匹配SQL

Question

的所有行更新列值嘗試以下查詢

update employee 
set e.Hours = tot.SumofWorkingHours 
from employee e 

inner join (select employeecode, sum(workingHours) as SumofWorkingHours 
      from Time 
      group by employeecode)tot 
      on tot.employeecode=e.code) 

我在這裏打。我想計算與員工代碼相對應的工作時間總和，並將員工表更新爲相應的員工代碼。

Answer 1

也許你可以使用一個CTE

;WITH cte AS (
SELECT EmployeeCode, SUM(WorkingHours) AS SumofWorkingHours 
     FROM Time 
     GROUP BY EmployeeCode) 

UPDATE e 
SET e.Hours = cte.SumofWorkingHours 
FROM Employee e 
INNER JOIN cte ON e.Code = cte.EmployeeCode 

我沒有任何數據來檢驗上述查詢，但如果它不爲你工作，提供一些測試數據，我們可以給出一個更準確的解決方案

也許你需要在UPDATE聲明後使用別名e。這是我會如何寫你原來的查詢（大寫OCD）：

UPDATE e 
SET e.Hours = tot.SumofWorkingHours 
FROM Employee e 
INNER JOIN (SELECT EmployeeCode, SUM(WorkingHours) AS SumofWorkingHours 
      FROM Time 
      GROUP BY EmployeeCode) tot 
      on tot.EmployeeCode = e.Code