diff --git a/Src/Asp.NetCore2/SqlSeverTest/UnitTest/Main.cs b/Src/Asp.NetCore2/SqlSeverTest/UnitTest/Main.cs
index e3258e9e4..dd84845b9 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/UnitTest/Main.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/UnitTest/Main.cs
@@ -31,6 +31,7 @@ namespace OrmTest
         }
         public static void Init()
         {
+            UCustom019.Init();
             UCustom015.Init();
             UCustom014.Init();
             UCustom012.Init();
diff --git a/Src/Asp.NetCore2/SqlSeverTest/UnitTest/UCustom019.cs b/Src/Asp.NetCore2/SqlSeverTest/UnitTest/UCustom019.cs
new file mode 100644
index 000000000..5cbc093a3
--- /dev/null
+++ b/Src/Asp.NetCore2/SqlSeverTest/UnitTest/UCustom019.cs
@@ -0,0 +1,102 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using SqlSugar;
+namespace OrmTest 
+{
+    internal class UCustom019
+    {
+        public static void Init()
+        {
+            var db = NewUnitTest.Db;
+
+            //建表 
+            if (!db.DbMaintenance.IsAnyTable("UintTest001", false))
+            {
+                db.CodeFirst.InitTables<UintTest001>();
+                //用例代码 
+                var dataList = new List<UintTest001>();
+                dataList.Add(new UintTest001() { id = 1, group = 1, addTime = DateTime.Now });
+                dataList.Add(new UintTest001() { id = 2, group = 1, addTime = DateTime.Now.AddDays(1) });
+                dataList.Add(new UintTest001() { id = 3, group = 2, addTime = DateTime.Now.AddDays(1) });
+                dataList.Add(new UintTest001() { id = 4, group = 2, addTime = DateTime.Now.AddDays(1) });
+                dataList.Add(new UintTest001() { id = 5, group = 2, addTime = DateTime.Now.AddDays(1) });
+                dataList.Add(new UintTest001() { id = 6, group = 3, addTime = DateTime.Now.AddDays(1) });
+                var result = db.Insertable(dataList).ExecuteCommand();//用例代码
+            }
+
+            var defaultTime = new DateTime(1900, 1, 1);
+            var nowTime = DateTime.Now;
+
+            var iQueryAble = db.Queryable<UintTest001>()
+                .GroupBy(it => it.group)
+                .GroupBy(it => it.addTime)
+                .Where(it=>it.id==1)
+                .Select<Test001_Ext>(it => new Test001_Ext
+                {
+                    group = it.group,
+                    addTime = it.addTime,
+                    lastTime = SqlFunc.AggregateMax(SqlFunc.IIF(it.group == 1, it.addTime, defaultTime)),
+                    lastTime2 = SqlFunc.AggregateMax(SqlFunc.IIF(it.group == 1, it.addTime, defaultTime))
+                });
+            var res = db.Queryable(iQueryAble)
+                           
+                            .InnerJoin<UintTest001>((i, t) => i.group == t.group)
+                            .Where((i,t)=>t.addTime < nowTime.AddDays(1))
+                            .ToList();
+            var json = @"
+[{""ConditionalList"":[{""Key"":-1,""Value"":{""FieldName"":""id"",""FieldValue"":1517454440779616256,""ConditionalType"":0,""CSharpTypeName"":""long""}},{""Key"":0,""Value"":{""FieldName"":""mobile_phone"",""FieldValue"":""13554067074"",""ConditionalType"":0,""CSharpTypeName"":""string""}},{""Key"":0,""Value"":{""ConditionalList"":[{""Key"":-1,""Value"":{""FieldName"":""template_id"",""FieldValue"":""1374856"",""ConditionalType"":0,""CSharpTypeName"":""long""}},{""Key"":0,""Value"":{""FieldName"":""send_content"",""FieldValue"":""1"",""ConditionalType"":1,""CSharpTypeName"":""string""}}]}}]}]
+";
+
+            var json2 = @"
+[{""ConditionalList"":[{""Key"":-1,""Value"":{""FieldName"":""id"",""FieldValue"":1517454440779616256,""ConditionalType"":0}},{""Key"":0,""Value"":{""FieldName"":""mobile_phone"",""FieldValue"":""13554067074"",""ConditionalType"":0,""CSharpTypeName"":""string""}},{""Key"":0,""Value"":{""ConditionalList"":[{""Key"":-1,""Value"":{""FieldName"":""template_id"",""FieldValue"":""1374856"",""ConditionalType"":0}},{""Key"":0,""Value"":{""FieldName"":""send_content"",""FieldValue"":""1"",""ConditionalType"":1,""CSharpTypeName"":""string""}}]}}]}]
+";
+            var cons=db.Utilities.JsonToConditionalModels(json);
+            var cons2 = db.Utilities.JsonToConditionalModels(json2);
+
+ 
+            var res21 = db.Queryable<UintTest001>()
+                            .InnerJoin<UintTest001>((i, t) => i.group == t.group)
+                            .Select((i, t) => new Test001_Ext
+                            {
+                                id = SqlFunc.Subqueryable<UintTest001>()
+                                .Where(s => s.id == 1)
+                                .Select(s =>s.id*i.id)
+                            }).ToList();
+            var res22 = db.Queryable<UintTest001>()
+                .InnerJoin<UintTest001>((i, t) => i.group == t.group)
+                .Select((i, t) => new Test001_Ext
+                {
+                    id = SqlFunc.Subqueryable<UintTest001>()
+                    .Where(s => s.id == 1)
+                    .Select(s => s.id * s.id)
+                }).ToList();
+            var  res23 = db.Queryable<UintTest001>()
+                            .InnerJoin<UintTest001>((i, t) => i.group == t.group)
+                            .Select((i, t) => new Test001_Ext
+                            {
+                                 id = SqlFunc.Subqueryable<UintTest001>()
+                                .Where(s => s.id == 1)
+                                .Select(s => SqlFunc.ToInt32(SqlFunc.AggregateSum(SqlFunc.DateDiff(DateType.Second, s.addTime, s.addTime)) / 3600.0))
+                            }).ToList();
+
+        }
+        //建类
+        public class UintTest001
+        {
+            public int id { get; set; }
+
+            public int group { get; set; }
+
+            public DateTime addTime { get; set; }
+        }
+
+        public class Test001_Ext : UintTest001
+        {
+            public DateTime lastTime { get; set; }
+            public DateTime lastTime2 { get;   set; }
+        }
+    }
+}