Mysql插入記錄從表A到表B.如果表B.列少於

Question

**Employee** 

PK empId 
firstName 
lastName 
isRegularEmp 


**Employee_Training** 

PK FK empId 
PK FK trainingId 
logId 


**Training** 

PK TrainingId 
date 
specialEmployeesNeeded 
regularEmployeesNeeded 
FK roomId 

我試圖通過特定日期將所有員工插入到employee_training表中。它的工作原理除了我需要的金額不超過SpecialEmployees/Regular Employees字段值。

例如，我在員工表中有200名普通員工和100名普通員工，但我只需要35名特殊員工和5名特殊員工按照培訓表中的規定插入。

我試過HAVING，但它一直拋出一個錯誤未知列。請幫助，我嘗試插入一種類型的員工，但它仍然不起作用

INSERT INTO EMPLOYEE_TRAINING(empId, trainingId) 


SELECT E.empId , T.TrainingId 


FROM EMPLOYEE E, TRAINING T 

WHERE T.`date` = "2013-4-20" 

AND E.isRegularEmp = false 

HAVING COUNT(E.empId) <= regularEmployeesNeeded 

我無法發佈我的erd，因爲我沒有足夠的積分。所以請裸露我

Answer 1

您的isRegularEmp條件的位置不正確。它應該放在WHERE條款中。

INSERT INTO EMPLOYEE_TRAINING(empId, trainingId) 

SELECT E.empId , T.TrainingId 

FROM EMPLOYEE E, TRAINING T 

WHERE T.`date` = "2013-4-20" 

AND E.isRegularEmp = false 

HAVING COUNT(E.empId) <= regularEmployees 

---

編輯：正如邁克爾·本傑明的答覆中指出，regularEmployees不是現場沒有定義。您需要SELECT正規僱員的COUNT。

INSERT INTO EMPLOYEE_TRAINING(empId, trainingId) 

SELECT E.empId , T.TrainingId 

FROM EMPLOYEE E, TRAINING T 

WHERE T.`date` = "2013-4-20" 

AND E.isRegularEmp = false 

HAVING COUNT(E.empId) <= (SELECT COUNT(*) FROM EMPLOYEE WHERE isRegularEmp = true) 

Answer 2

regularEmployees是不是在你的任何表的列，也不是在查詢的任何地方定義。嘗試

INSERT INTO EMPLOYEE_TRAINING(empId, trainingId) 

SELECT E.empId , T.TrainingId 

FROM EMPLOYEE E, TRAINING T 

WHERE T.`date` = "2013-4-20" 

AND E.isRegularEmp = false 

HAVING COUNT(E.empId) <= (select count(*) from EMPLOYEE where isRegularEmp=true)