LeetCode MySQL 1322. 广告效果
文章目录
- 1. 题目
- 2. 解题
1. 题目
表: Ads
+---------------+---------+ | Column Name | Type | +---------------+---------+ | ad_id | int | | user_id | int | | action | enum | +---------------+---------+ (ad_id, user_id) 是该表的主键 该表的每一行包含一条广告的 ID(ad_id), 用户的 ID(user_id) 和用户对广告采取的行为 (action) action 列是一个枚举类型 ('Clicked', 'Viewed', 'Ignored') 。一家公司正在运营这些广告并想计算每条广告的效果。
广告效果用点击通过率(Click-Through Rate:CTR)来衡量,公式如下:
CTR={0,if Ad total clicks +Ad total views =0Ad total clicks Ad total clicks +Ad total views ×100,otherwise C T R=\left\{\begin{array}{ll}0, & \text { if Ad total clicks }+\text { Ad total views }=0 \\ \frac{\text { Ad total clicks }}{\text { Ad total clicks }+\text { Ad total views }} \times 100, & \text { otherwise }\end{array}\right.CTR={0, Ad total clicks + Ad total views Ad total clicks ×100, if Ad total clicks + Ad total views =0 otherwise
写一条SQL语句来查询每一条广告的 ctr ,
ctr 要保留两位小数。结果需要按 ctr 降序、按 ad_id 升序 进行排序。
查询结果示例如下:
Ads 表: +-------+---------+---------+ | ad_id | user_id | action | +-------+---------+---------+ | 1 | 1 | Clicked | | 2 | 2 | Clicked | | 3 | 3 | Viewed | | 5 | 5 | Ignored | | 1 | 7 | Ignored | | 2 | 7 | Viewed | | 3 | 5 | Clicked | | 1 | 4 | Viewed | | 2 | 11 | Viewed | | 1 | 2 | Clicked | +-------+---------+---------+ 结果表: +-------+-------+ | ad_id | ctr | +-------+-------+ | 1 | 66.67 | | 3 | 50.00 | | 2 | 33.33 | | 5 | 0.00 | +-------+-------+ 对于 ad_id = 1, ctr = (2/(2+1)) * 100 = 66.67 对于 ad_id = 2, ctr = (1/(1+2)) * 100 = 33.33 对于 ad_id = 3, ctr = (1/(1+1)) * 100 = 50.00 对于 ad_id = 5, ctr = 0.00, 注意 ad_id = 5 没有被点击 (Clicked) 或查看 (Viewed) 过 注意我们不关心 action 为 Ingnored 的广告 结果按 ctr(降序),ad_id(升序)排序来源:力扣(LeetCode) 链接:https://leetcode-cn.com/problems/ads-performance
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2. 解题
# Write your MySQL query statement below select ad_id, round(ifnull(sum(action = 'Clicked')/(sum(action = 'Clicked')+sum(action = 'Viewed'))*100, 0) ,2) as ctr from Ads group by ad_id order by ctr desc, ad_idor
# Write your MySQL query statement below select ad_id, round(ifnull(sum(action = 'Clicked')/(sum(action != 'Ignored'))*100, 0) ,2) as ctr from Ads group by ad_id order by ctr desc, ad_id我的CSDN博客地址 https://michael.blog.csdn.net/
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