1、左连接: var LeftJoin = from emp in ListOfEmployees join dept in ListOfDepartment on emp.DeptID equals dept.ID into JoinedEmpDept from dept ...
第一个集合为所有的数据 var specilist new List lt Me.SpecificationsInfo gt var resultall from a in dbContext.by sku items join b in dbContext.by attributes on a.by attributes id equals b.by attributes id join c ...
2017-06-21 10:43 0 1600 推荐指数:
1、左连接: var LeftJoin = from emp in ListOfEmployees join dept in ListOfDepartment on emp.DeptID equals dept.ID into JoinedEmpDept from dept ...
--一本错误的记录 insert into Book values('错误时怎样练成的',111) --左连接 select s.name,b.name from student as s left join Book as b on s.id ...
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所先创建2个DataTable并对其赋值,来进行模拟. DataTable dt1 = new DataTable(); dt1.Columns.Add("ID", typeof(int)); ...
List<int> listA = new List<int> {1,2,3,5,7,9};List<int> listB = new List<int> ...
List<BsonDocument> bsonList = new List<BsonDocument>();List<BsonDocument> list= new List<BsonDocument>(); // 合并bsonList ...
//两个list合并处理 /unreadMsgList = unreadMsgList.Union(list).ToList(); //合并处理[MsgCount] unreadMsgList.ForEach(c => { var group = unreadMsgList.Where ...
集合:List<Map> 1.模板集合 2.构建 3.应用场景:图表、集合合并分组构建数据等场景,主要流程为: 3-1.观察数据库查出来的数据是什么格式 ,然后格式定义和初始化好数据结构模板 3-2.将db数据合并到模板数据中 ...