1. 题目

描述
A game database contains two tables, player table and recharge table.
Write a SQL query to find all players who never recharge.

样例

https://www.lintcode.com/problem/players-who-never-recharge/description

2. 解题

-- Write your SQL Query here --
-- example: SELECT * FROM XX_TABLE WHERE XXX --
select name player from user
where user.id not in
(select distinct(user_id) user_idfrom recharge
)