我试图找到一种计算最大计数(r.customer_id(的方法。运行脚本时,有 4 个具有相同最大值的值,所以我需要生成的是一个包含这 4 个值的表
SELECT c1.customer_id, c1.first_name, c1.last_name, count(r.customer_id)
FROM customer c1
INNER JOIN rental r
ON (c1.customer_id = r.customer_id)
WHERE r.staff_id = 2
GROUP BY c1.customer_id, c1.first_name, c1.last_name
ORDER BY 4 desc
SELECT customer_id, first_name, last_name, count
FROM (
SELECT c1.customer_id as customer_id, c1.first_name as first_name, c1.last_name as last_name, count(r.customer_id) as count
FROM customer c1
INNER JOIN rental r ON ( c1.customer_id = r.customer_id )
WHERE r.staff_id = 2
GROUP BY c1.customer_id, c1.first_name, c1.last_name
) x
GROUP BY customer_id, first_name, last_name
HAVING count = max(count)
order by 4 desc