列出客户名称和已下达超过4个订单的客户下达的订单数量

Question

有两个表：

1. customer：cust_id和details of customer address
2. order - ord_id，cust_id，ord_quantity

对于一个cust_id，有许多orders，即许多ord_id

Answer 1

SELECT
    c.*,
    o.total_order
FROM    customer c
LEFT JOIN (
    SELECT
        cust_id,
        count(*) AS total_order
    FROM ORDER
    GROUP BY cust_id
    HAVING count(*) > 4
) o 
ON o.cust_id = c.cust_id
WHERE
    o.cust_id IS NOT NULL;

它应该返回欲望结果