1581. 进店却未进行过交易的顾客 原题:https://leetcode.cn/problems/customer-who-visited-but-did-not-make-any-transactions/ 题意:有一些顾客可能光顾了购物中心但没有进行交易。请你编写一个解决方案,来查找这些顾客的 ID (customer_id),以及他们只光顾不交易的次数(count_no_trans)。 分析:customer_id来...
来源:力扣(LeetCode) 链接:https://leetcode.cn/problems/all-the-pairs-with-the-maximum-number-of-common-followers #测试数据 Create table If Not Exists Relations (user_id int, follower_id int); insert into Relations (user_id, follower_id) values ('1', '3'); insert into Relations (user_...
d) 建表SQL CreatetableIfNotExistsEmployee(Idint,Namevarchar(255),Salaryint,DepartmentIdint)CreatetableIfNotExistsDepartment(Idint,Namevarchar(255))TruncatetableEmployeeinsertintoEmployee(Id,Name,Salary,DepartmentId)values('1','Joe','85000','1')insertintoEmployee(Id,Name,Salary,DepartmentId)values('...
来源:力扣(LeetCode) 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)valu...
# https://leetcode.cn/problems/customers-who-never-order/solution/cong-bu-ding-gou-de-ke-hu-by-leetcode/ SQL 注释 MySQL -- 单行注释/* 多行注释 */ https://www.ibm.com/docs/zh/db2/9.7?topic=statements-comments refs https://github.com/xgqfrms/SQL ...
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链接:https://leetcode-cn.com/problems/find-cumulative-salary-of-an-employee 著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。 代码中使用一个范围连表,在使用最小月份去重最后一个月 # Write your MySQL query statement below ...
链接:https://leetcode-cn.com/problems/all-people-report-to-the-given-manager 著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。 # Write your MySQL query statement belowselectdistinct a.employee_idfromEmployeesa,Employeesb,Employeescwherea.manager_id=b.employee_id and b.manager_...
Write a SQL query to find all numbers that appear at least three times consecutively. For example, given the above Logs table, 1 is the only number that appears consecutively for at least three times. 三、参考SQL 方法一:多次连接 select distinct a.num as ConsecutiveNumsfrom Logs ainner join...
SQL INTERVIEW QUESTIONS AND ANSWERS 3 | P a g e 3.What is the difference between the “DELETE” and “TRUNCATE” commands? The DELETE command is used to remove rows from a table based on a WHERE condition whereas TRUNCATE removes all rows from a table. ...