目录

题目

准备数据

分析数据

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题目

编写解决方案找出 至少有一个 订单的金额 严格大于 500 的客户的数量。

准备数据

Create table If Not Exists Store (bill_id int, customer_id int, amount int)
    Truncate table Store
    insert into Store (bill_id, customer_id, amount) values ('6', '1', '549')
    insert into Store (bill_id, customer_id, amount) values ('8', '1', '834')
    insert into Store (bill_id, customer_id, amount) values ('4', '2', '394')
    insert into Store (bill_id, customer_id, amount) values ('11', '3', '657')
    insert into Store (bill_id, customer_id, amount) values ('13', '3', '257')

分析数据

select count( distinct customer_id) rich_count
from store
where amount > 500;