Question

我遇到以下子查询的问题：

(select AVG(retail) 
 from STOCK 
 where category = 'TOYOTA' or category = 'HONDA') as AVERAGE_SALE_PRICE

整个查询：

select 
    d.name, s.category,(select AVG(retail) 
    where category = 'TOYOTA' or category = 'HONDA') as  AVERAGE_SALE_PRICE
from dealer d join stock s using (dealerID)

问题是这个计算字段为查询中的所有行返回相同的值，我知道我可能添加了一个GROUP BY，但我很困惑......

感谢您的帮助

Answer 1

尝试此查询：

static

更新。这应该会给你想要的结果：

select AVG(retail) as AVERAGE_SALE_PRICE, category
from STOCK 
where category='TOYOTA' or category='HONDA'
group by category

计算字段返回相同的值SQL

1 个答案: