将此语句转换为sql查询

Question

显示包裹号和每个包裹号的顾客数量，仅适用于拥有100个以上顾客的包裹。

SELECT pack_num, COUNT(customer) 
FROM table_name 
GROUP BY pack_num
HAVING COUNT(customer) >100

这个查询正确吗？ 如果没有，请纠正我。

Answer 1

要只计算唯一的客户，可以在COUNT上添加DISTINCT 。

SELECT pack_num, COUNT(DISTINCT customer) 
FROM table_name 
GROUP BY pack_num
HAVING COUNT(DISTINCT customer) >100