在甲骨文

Question

通过表达创建视图与子查询和组为了获取特定的数据集，我在选择查询这是一组由表达式如下使用子查询：

SELECT SUM(b.RESERVEDROOMS) AS "Reserved Rooms", 
     (SELECT country 
      FROM location 
     WHERE location_id = b.location_id) AS "Country" 
    FROM bookingsRevenue b, 
     location l 
WHERE b.location_id = l.location_id 
GROUP BY b.location_id 

它工作正常和正确的数据被检索，但是当我尝试从它创建一个视图时，显示以下错误。你能帮我解决这个问题吗？

[错误]执行（21：74）：ORA-00979：不是GROUP BY表达

Answer 1

似乎

有在源代码中的混乱的。 GROUP BY子句不正确，您也不需要使用相关的子查询。如果你还想进行分组的LOCATION_ID然后

SELECT SUM(b.RESERVEDROOMS) AS "Reserved Rooms", l.country AS "Country" 
FROM bookingsRevenue b 
JOIN location l ON (b.location_id = l.location_id) 
GROUP BY l.country; 

：

SELECT SUM(b.RESERVEDROOMS) AS "Reserved Rooms", b.location_id, l.country AS "Country" 
FROM bookingsRevenue b 
JOIN location l ON (b.location_id = l.location_id) 
GROUP BY b.location_id, l.country;