2036. Intersect Until You're Sick of It 题目连接: http://acm.timus.ru/problem.aspx?space=1&num=2036 Description Ural contests usually contain a lot of geometry problems. Many participants do not conceal their discontent with such disbalance. Still, we ha…
A - Intersect Until You're Sick of It Time Limit:500MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Practice URAL 2036 Description Ural contests usually contain a lot of geometry problems. Many participants do not conceal…
2025. Line Fighting Time limit: 1.0 second Memory limit: 64 MB Boxing, karate, sambo- The audience is sick of classic combat sports. That is why a popular sports channel launches a new competition format based on the traditional Russian entertainment…
适用场景:对两个集合的处理,例如追加.合并.取相同项.相交项等等. Concat(连接) 说明:连接不同的集合,不会自动过滤相同项:延迟. 1.简单形式: var q = ( from c in db.Customers select c.Phone ).Concat( from c in db.Customers select c.Fax ).Concat( from e in db.Employees select e.HomePhone ); 语句描述:返回所有消费者和雇员的电话和传真.…
一.union与union all 首先建两个view create or replace view test_view_1 as as c from dual union as c from dual union as c from dual ; ----- create or replace view test_view_2 as as c from dual union as c from dual union as c from dual order by a desc, b desc,…
集合操作符专门用于合并多条select语句的结果,包括:UNION,UNION ALL,INTERSECT,MINUS.当使用集合操作函数时,需保证数据集的字段数据类型和数目一致. 使用集合操作符需要注意: 集合操作符不适用于log.varray和嵌套列表. union.interesect和minus操作不可作用于long列. 如果选择列中包含有表达式或者函数,那么必须为表达式或者函数定义列别名. 1.UNION 当使用union时,自动过滤到数据集中重复的列,并以第一列的结果进行升序排序.…
找到两个集合中交集部分: source code: IEnumerable<int> a = new List<int>{ { }, { }, { } }; IEnumerable<int> b = new List<int> { { }, { }, { } }; IEnumerable<int> result = a.Intersect(b); result.ForEach(delegate (int n) { Write(n); });…
内连接查询 内连接与SqL中inner join一样,即找出两个序列的交集 Model1Container model = new Model1Container(); //内连接 var query = from s in model.Student join c in model.Course on s.CourseCno equals c.Cno select new { ClassID = s.CourseCno, ClassName = c.Cname, Student = new {…
http://www.cnblogs.com/qinpengming/archive/2012/12/03/2800202.html List之Union(),Intersect(),Except() 亦可以说是数学中的并集,交集,差集 http://blog.csdn.net/lingxyd_0/article/details/20877721  C# 对List<T>取交集.连集及差集 https://msdn.microsoft.com/en-us/library/bb336390.as…
UNION 查询选修了180101号或180102号课程或二者都选修了的学生学号.课程号和成绩. (SELECT  学号, 课程号, 成绩 FROM   学习 WHERE   课程号='180101') UNION (SELECT 学号, 课程号, 成绩 FROM 学习 WHERE    课程号='180102') 与SELECT子句不同,UNION运算自动去除重复.因此,在本例中,若只输出学生的学号,则相同的学号只出现一次.如果想保留所有的重复,则必须用UNION ALL代替UNION,且查询…