having子句問題

Question

使用Employee和Department表從previous question

我試圖建立顯示，在總部和研發部門工作的僱員數量相互結合表。

我已經試過這個目前爲止，但不斷收到我有條款的錯誤。有什麼建議麼？

mysql> select e.fname, d.dname 
    -> from department d 
    -> inner join employee e on e.dno = d.dnumber 
    -> group by e.fname 
    -> having d.dname='Headquarters','Research'; 
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to 
use near ''Research'' at line 5 
mysql> select e.fname, d.dname 
    -> from department d 
    -> inner join employee e on e.dno = d.dnumber 
    -> group by e.fname 
    -> having d.dname=1,5; 
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to 
use near '5' at line 5 

Answer 1

使用IN在WHERE條款。

SELECT... 
FROM... 
WHERE d.dname IN ('Headquarters','Research') 
GROUP BY...