sql - Access sql内连接并统计2个表

Question

我有一个关于access中sql查询的问题(我三天前才开始)

所以有 2 个表:员工和部门，我想要的是创建一个查询，该查询将显示每个员工的姓名和 ID 以及他管理的部门数量。

Employee( ID, NAME, social_security_of_employe)

Department(department_id, social_security_of_employee)

(社保是我的首要关键) 我的尝试是:

SELECT E.ID, E.NAME, COUNT(D.SOCIAL_SECURITY) AS NUMBER_OF_DEPARTMENTS

FROM EMPLOYEE E

INNER JOIN DEPARTMENT D

WHERE D.SOCIAL_SECURITY=E.SOCIAL_SECURITY

GROUP BY SOCIAL_SECURITY

提前致谢

Answer 1

MS Access 的正确语法是:

SELECT E.ID, E.NAME, COUNT(D.SOCIAL_SECURITY) AS NUMBER_OF_DEPARTMENTS
FROM EMPLOYEE as E INNER JOIN
     DEPARTMENT as D
     ON D.SOCIAL_SECURITY = E.SOCIAL_SECURITY
GROUP BY E.ID, E.NAME;

变化:

• MS Access 需要 as 作为表别名。
• WHERE 子句应该是 ON 子句。
• GROUP BY 中的列需要与 SELECT 中未聚合的列匹配。