SQL查询，努力用COUNT（）计算实例/出现次数

Question

我正在尝试计算以下两个表中的访问次数：

宠物餐桌：

访问表：

这是我的SQL ：

 SELECT pet_name, pet_type
 FROM pets p
 JOIN visits v
 ON p.petid = v.petid
 SELECT COUNT(petid) AS "NUMBER OF VISITS" FROM visits
 WHERE petid = "PT5"

并且它返回此错误消息：

 ORA-00933: SQL command not properly ended

有什么想法我做错了什么？

Answer 1

SELECT p.pet_name, p.pet_type, COUNT(v.petid) AS "NUMBER OF VISITS"
FROM pets p
JOIN visits v ON p.petid = v.petid
WHERE p.petid = "PT5"
GROUP BY p.pet_name, p.pet_type