Update demo

Src/Asp.Net/SqlServerTest/6_NavigationProperty.cs

@@ -15,7 +15,7 @@ namespace OrmTest
         /// </summary>
         public static void Init()
         {
-            var db = NewUnitTest.Db;
+            var db = DbHelper.GetNewDb();
 
             // Initialize database table structures.
             // 初始化数据库表结构。

Src/Asp.Net/SqlServerTest/7_GroupQuery.cs

@@ -0,0 +1,74 @@
+using SqlSugar;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OrmTest
+{
+    internal class _7_GroupQuery
+    {
+        public static void Init()
+        {
+            var db = DbHelper.GetNewDb();
+            List<Student> students = new List<Student>
+            {
+                new Student { Id = 1, Name = "Alice", Age = 20 },
+                new Student { Id = 2, Name = "Bob", Age = 22 },
+                new Student { Id = 3, Name = "Alice", Age = 21 },
+                new Student { Id = 4, Name = "Charlie", Age = 19 },
+                new Student { Id = 5, Name = "Bob", Age = 20 }
+            };
+             
+            // 初始化数据库表结构，如果表不存在则创建 (Initialize database table structure; create if not exists)
+             db.CodeFirst.InitTables<Student>();
+
+            // 清空指定表中的所有数据 (Truncate all data in the specified table)
+            db.DbMaintenance.TruncateTable<Student>();
+
+            //插入记录(Insert datas)
+            db.Insertable(students).ExecuteCommand();
+
+            // 分组查询示例 (Grouping Query Example)
+            var groupedStudents = db.Queryable<Student>()
+                                     .GroupBy(s => s.Name)
+                                     .Select(g => new
+                                     {
+                                         Name = g.Name, // 学生姓名 (Student Name)
+                                         Count = SqlFunc.AggregateCount(g.Id), // 学生数量 (Count of Students)
+                                         AverageAge = SqlFunc.AggregateAvg(g.Age), // 平均年龄 (Average Age)
+                                         MaxAge = SqlFunc.AggregateMax(g.Age), // 最大年龄 (Maximum Age)
+                                         MinAge = SqlFunc.AggregateMin(g.Age) // 最小年龄 (Minimum Age)
+                                     })
+                                     .ToList();
+
+
+            // 去重查询示例 (Distinct Query Example)
+            var distinctNames = students.Select(s => s.Name).Distinct().ToList();
+
+
+            // 分组取第一条记录示例 (Group First Record Example)
+            var groupFirstRecord = db.Queryable<Student>()
+                                       .Select(g => new
+                                       {
+                                           index = SqlFunc.RowNumber(SqlFunc.Desc(g.Id), g.Name),
+                                           Id = g.Id,
+                                           Name = g.Name,
+                                           Age =g.Age 
+                                       })
+                                       .MergeTable()
+                                       .Where(it => it.index == 1)
+                                       .ToList();
+        }
+
+        [SqlSugar.SugarTable("Student07")]
+        public class Student
+        {
+            [SqlSugar.SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            public int Id { get; set; } // 学生ID (Student ID)
+            public string Name { get; set; } // 学生姓名 (Student Name)
+            public int Age { get; set; } // 学生年龄 (Student Age)
+        }
+    }
+}

Src/Asp.Net/SqlServerTest/Program.cs

@@ -14,6 +14,7 @@ namespace OrmTest
             _4_JoinQuery.Init();
             _5_PageQuery.Init();
             _6_NavQuery.Init();
+            _7_GroupQuery.Init();
         }
     }
 

Src/Asp.Net/SqlServerTest/SqlServerTest.csproj

@@ -70,6 +70,7 @@
     <Compile Include="5_PageQuery.cs" />
     <Compile Include="UnitTest\Description.cs" />
     <Compile Include="3_EasyQuery.cs" />
+    <Compile Include="7_GroupQuery.cs" />
     <Compile Include="UserTestCases\Cases\OldDemo\Demo2_Updateable.cs" />
     <Compile Include="UserTestCases\Cases\OldDemo\Demo3_Insertable.cs" />
     <Compile Include="UserTestCases\Cases\OldDemo\Demo4_Deleteable.cs" />