我有这些表格:
Customers ( cid , cname )
Products ( pid , pcolor)
Reservations ( pid , cid , date)
我需要知道最常被保留的产品是什么颜色,到目前为止我写了这个:
SELECT p.color, count(p.pid) as j
FROM products as p , reservations as res
WHERE p.pid = res.pid
GROUP BY p.color
ORDER BY j DESC
LIMIT 1
现在这个查询效果很好,但是有一点小问题,如果有2种不同颜色的产品保留了相同的次数,它只给出了其中一种(因为&#34 ;限制1")..我该怎么办?
答案 0 :(得分:-1)
SELECT pr.pcolor, count(pr.pid)
FROM Products pr
JOIN Reservations res
ON pr.pid = res.pid
GROUP BY pr.pcolor