概念 触发器是一种特殊类型的存储过程，不由用户直接调用。创建触发器时会对其进行定义，以便在对特定表或列作特定类型的数据修改时执行。 触发器可以查询其他表，而且可以包含复杂的 SQL 语句。 它们主要用于强制服从复杂的业务规则或要求。 例如，您可以根据客户当前的帐户状态，控制是否
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There are a total of n courses you have to take, labeled from 0 to n-1. Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which is expressed as a pair: [0,1] Given the total number of courses and a list of
二分图匹配的模板 二分图：如果顶点集 V可分割为两个互不相交的子集X和Y，并且图中每条边连接的两个顶点一个在 X中，另一个在 Y中，则称图G为二分图。 交替路：从一个未匹配点出发，依次经过非匹配边、匹配边、非匹配边…形成的路径叫交替路 增广路：两个端点都是未盖点的交替路叫做可增广路
一天满课，晚上旷了院长的会来完成任务 项目三：超过5名学生的课（难度：简单） 创建如下所示的courses 表 ，有: student (学生) 和 class (课程)。 +---------+------------+| student | class |+---------+------------+| A | Math || B | English || C |
题目如下： There are a total of n courses you have to take, labeled from 0 to n-1. Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which is expressed as a pair: [0,1] Given the total number of courses and
/* 加粗：语音部分 * 红色：单词部分 * 斜体：语法部分 * 下划线：信号词/句 */ 第 1 段 1.Listen to a conversation between a student and her public relations professor. 听一段学生和她公共关系教授的对话你好戈登教授。 第 2 段 1.Hi, professor Gordin, I really lear
Zhejiang University has 40000 students and provides 2500 courses. Now given the student name lists of all the courses, you are supposed to output the registered course list for each student who comes for a query. Input Specification: Each input file conta
有一个courses 表 ，有: student (学生) 和 class (课程)。 请列出所有超过或等于5名学生的课。 例如,表: +---------+------------+ | student | class | +---------+------------+ | A | Math | | B | English | | C | Math | | D
