Add user case test

Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/Main.cs

@@ -32,6 +32,7 @@ namespace OrmTest
         }
         public static void Init()
         {
+            UnitTreaaafasa.Init();
             UnitaadfafxSubToList.Init();
             UnitGridSave2.Init();
             Unitdfafa11.Init();

Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/UnitTreaaafasa.cs

@@ -0,0 +1,62 @@
+using SqlSugar;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OrmTest
+{
+    internal class UnitTreaaafasa
+    {
+        public static void Init() 
+        {
+            var db = NewUnitTest.Db;
+            var pageIndex = 1;
+            var pageSize = 10;
+            RefAsync<int> total = 0;
+            var list =   db.Queryable<TableA>()
+                .Where(t => t.Id == 1)
+                .Select(t => new  
+                {
+                    Id = t.Id,
+                    Name = t.AName,
+                    Amount = SqlFunc.Subqueryable<TableB>()
+                        .LeftJoin<TableC>((tableB, tableC) => tableB.TableCId == tableC.Id)
+                        .LeftJoin<TableD>((tableB, tableC, tableD) => tableB.TableDId == tableD.Id)
+                        .Where((tableB, tableC, tableD) => tableD.TableAId == t.Id)
+                        .Sum((tableB, tableC, tableD) => SqlFunc.IsNull(tableB.Quantity * tableB.Price, 0))
+                }).ToPageListAsync(pageIndex, pageSize, total).GetAwaiter().GetResult();
+
+        }
+        public class BaseEntity
+        {
+            [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            public int Id { get; set; }
+        }
+        public class TableA : BaseEntity
+        {
+            public string AName { get; set; }
+        }
+        public class TableC : BaseEntity
+        {
+            public string CName { get; set; }
+        }
+        public class TableB : BaseEntity
+        {
+            public string BName { get; set; }
+            public int TableCId { get; set; }
+            public int TableDId { get; set; }
+            public decimal Quantity { get; set; }
+            public decimal Price { get; set; }
+        }
+
+        public class TableD : BaseEntity
+        {
+            public string DName { get; set; }
+            public int TableAId { get; set; }
+        }
+    }
+
+
+}