这道题要求找出连续出现至少三次的数 这道题可以用自联结来解决,解决思路就是,找到id大1且num相等以及id号大2且num相等的num,具体SQL如下: SELECT DISTINCT log1.Num AS 'ConsecutiveNums' FROM Logs log1 INNER JOIN Logs log2 ON (log2.Id = log1.Id+1 AND log2.Num = log1.Num) INNER JOIN Logs...
FROM-on->WHERE->GROUPBY-> HAVING ->SELECT的字段 ->DISTINCT->ORDERBY-> LIMIT 例如: SELECTDISTINCTplayer_id, player_name,count(*) as num# 顺序 5FROM playerJOINteam ON player.team_id = team.team_id# 顺序 1WHERE height >1.80# 顺序 2GROUPBYplayer.team_id# 顺序 3HAVING num >2# 顺序 4...
com/problems/consecutive-numbers/solution/lian-xu-chu-xian-de-shu-zi-by-leetcode/ 6 超过经理收入的员工 left join 除了= 还可以> 我 Select Name as Employee from (select p.*,q.sALARY AS MANAGERsalary from Employee p left join Employee q ON p.MANAGERid = q.ID) t where sALARY > MANAGER...
题解:select v.customer_id, count(*) as count_no_trans from Visits as v left join Transactions as t on v.visit_id = t.visit_id where t.transaction_id is null group by v.customer_id;197. 上升的温度原题:https://leetcode.cn/problems/rising-temperature/...
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链接:https://leetcode.cn/problems/all-the-pairs-with-the-maximum-number-of-common-followers #测试数据 Create table If Not ExistsRelations(user_id int,follower_id int);insert intoRelations(user_id,follower_id)values('1','3');insert intoRelations(user_id,follower_id)values('2','3');inser...
https://leetcode-cn.com/problems/customers-who-never-order/ 📕解题思路 根据题目,我们先看题目要求我们查什么,要查出从不订购任何东西的顾客。根据这一点我们可以从Orders订单表中得知CustomerId为1和3的是订购过东西的顾客,而2和4则没有订购过任何东西。再从Customers顾客表中查id2与id4对应的顾客名字就查...
Write a SQL query to find all customers who never order anything. Using the above tables as an example, return the following: 三、参考SQL 方法一:左外连接 1 select Name as Customers2 from Customers c3 left join Orders o4 on =o.CustomerId 5 where is null; 1. 2. 方法二:子查询(官方方...
https://leetcode-cn.com/problems/rising-temperature/ Write an SQL query to find all dates' id with higher temperature compared to its previous dates (yesterday). Return the result table in any order. 题意 编写一个 SQL 查询,来查找与之前(昨天的)日期相比温度更高的所有日期的 id 。返回结果 ...
Efficient solutions to LeetCode problems. shellsqlalgorithmsleetcodecppmodern-cppdata-structuresleetcode-solutionscoding-challengescompetettive-programmingcoding-interview-preparationsleetcode-solutions-cppefficient-solutionsexplained-solutions UpdatedMay 16, 2025 ...