1、左連接: var LeftJoin = from emp in ListOfEmployees join dept in ListOfDepartment on emp.DeptID equals dept.ID into JoinedEmpDept from dept ...
第一個集合為所有的數據 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 ...
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1、左連接: var LeftJoin = from emp in ListOfEmployees join dept in ListOfDepartment on emp.DeptID equals dept.ID into JoinedEmpDept from dept ...
--一本錯誤的記錄 insert into Book values('錯誤時怎樣練成的',111) --左連接 select s.name,b.name from student as s left join Book as b on s.id ...
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所先創建2個DataTable並對其賦值,來進行模擬. 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>(); // 合並bsonList ...
//兩個list合並處理 /unreadMsgList = unreadMsgList.Union(list).ToList(); //合並處理[MsgCount] unreadMsgList.ForEach(c => { var group = unreadMsgList.Where ...
集合:List<Map> 1.模板集合 2.構建 3.應用場景:圖表、集合合並分組構建數據等場景,主要流程為: 3-1.觀察數據庫查出來的數據是什么格式 ,然后格式定義和初始化好數據結構模板 3-2.將db數據合並到模板數據中 ...