为什么要求我输入参数值？ MS Access SQL

Question

SELECT DNAME, COUNT(*) AS TotalPerDep
FROM EMPLOYEE AS E, Department AS D
WHERE D.DNUMBER = E.DNO
GROUP BY D.DName
HAVING SUM(TotalPerDep) <4;

I am not sure why this prompts me to enter a parameter value. If I remove the HAVING portion it works just fine.

Answer 1

There is no column named TotalPerDep . You can not use SUM() in having clause on alias this way. Do you just want Having count(*)<4 instead? please share your sample data and desired output to let me help you finding your solution.

SELECT DNAME, COUNT(*) AS TotalPerDep
FROM EMPLOYEE AS E, Department AS D
WHERE D.DNUMBER = E.DNO
GROUP BY D.DName
HAVING count(*) <4;