爲什麼我得到這個錯誤?有子句錯誤的子查詢,我錯過了什麼?
SELECT unitCode
FROM Enrolment
WHERE count(studentID) >
(SELECT AVG(Students) AS avgstudents
FROM (SELECT COUNT(*) AS Students
FROM Enrolment AS Enrolment_1
GROUP BY unitCode) AS a))
任何幫助我的代碼???? –