ORACLE SQL计数或计数

Question

尝试检索多个副本的艺术家数量，我正在尝试使用以下SQL返回错误。

  

ORA-00937：不是单组组功能00937. 00000 - “不是   单组组功能“*原因：*动作：线路错误：22   专栏：8

SELECT W.WORKID,A.LASTNAME,A.FISRTNAME, COUNT(W.ARTISTID) AS Orders
FROM ( WORK W INNER JOIN ARTIST A
ON W.ARTISTID=A.ARTISTID)
GROUP BY A.LASTNAME, W.WORKID, A.FISRTNAME
HAVING COUNT (W.ARTISTID) > 1;

SELECT WORKID,LASTNAME,FIRSTNAME
FROM WORK W, ARTIST A
WHERE W.ARTISTID = A.ARTISTID
HAVING COUNT (W.ARTISTID) > 1;