力扣sql中等篇练习(十四)
1 最后一个能进入电梯的人
1.1 题目内容
1.1.1 基本题目信息
1.1.2 示例输入输出
1.2 示例sql语句
# 在表某一个范围内的可以考虑自连接的方式,注意连接的表只需要精准的字段
# 需要排序是因为它需要找到最后一个上车的用户
SELECT q1.person_name
FROM
(
SELECT person_name,turn
FROM Queue
)q1
INNER JOIN
(
SELECT turn,weight
FROM Queue
)q2
ON q1.turn>=q2.turn
GROUP BY q1.turn
HAVING sum(q2.weight)<=1000
ORDER BY q1.turn desc
limit 1
1.3 运行截图
2 每月交易Ⅱ
2.1 题目内容
2.1.1 基本题目信息
2.1.2 示例输入输出
a 示例输入
b 示例输出
2.2 示例sql语句
# 需要新开一个列 区分退单还是批准
# 无论是批准还是拒绝,都可以退单
SELECT t1.month,t1.country,
SUM(IF(t1.state='approved' AND t1.flag=1,1,0)) approved_count,
SUM(IF(t1.state='approved' AND t1.flag=1,amount,0)) approved_amount,
SUM(IF(t1.flag=0,1,0)) chargeback_count,
SUM(IF(t1.flag=0,amount,0)) chargeback_amount
FROM
(
-- 0代表退单,1代表批准
SELECT t.id,t.country,t.state,t.amount,date_format(c.trans_date,'%Y-%m') month,0 flag
FROM Transactions t
RIGHT JOIN Chargebacks c
ON t.id=c.trans_id
UNION ALL
SELECT id,country,state,amount,date_format(trans_date,'%Y-%m') month,1 flag
FROM Transactions
WHERE state='approved'
)t1
GROUP BY t1.month,t1.country
2.3 运行截图
3 查询球队积分
3.1 题目内容
3.1.1 基本题目信息1
3.1.2 基本题目信息2
3.1.3 示例输入输出
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3.2 示例sql语句
# 有的球队可能只打过主场或者只打过客场
# UNION ALL两表连接时就算有group by 也可以在其后写union all
SELECT t1.team_id,t1.team_name,IFNULL(t3.num_points,0) num_points
FROM Teams t1
LEFT JOIN
(
SELECT t2.host_team,sum(t2.score) num_points
FROM
(
SELECT host_team,sum(IF(host_goals>guest_goals,3,IF(host_goals=guest_goals,1,0))) score
FROM Matches
GROUP BY host_team
UNION ALL
SELECT guest_team host_team,sum(IF(host_goals<guest_goals,3,IF(host_goals=guest_goals,1,0))) score
FROM Matches
GROUP BY guest_team
)t2
GROUP BY t2.host_team
)t3
ON t1.team_id=t3.host_team
ORDER BY num_points desc,t1.team_id asc
3.3 运行截图
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