diff --git a/Src/Asp.NetCore2/SqlSugar/Abstract/QueryableProvider/IncludesHelper.cs b/Src/Asp.NetCore2/SqlSugar/Abstract/QueryableProvider/IncludesHelper.cs
index 929fbdba8..c080e9752 100644
--- a/Src/Asp.NetCore2/SqlSugar/Abstract/QueryableProvider/IncludesHelper.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Abstract/QueryableProvider/IncludesHelper.cs
@@ -45,7 +45,10 @@ namespace SqlSugar
             if (this.QueryBuilder.Includes == null) this.QueryBuilder.Includes = new List<object>();
             this.QueryBuilder.Includes.Add(navigat);
         }
-
+        public NavISugarQueryable<T> AsNavQueryable() 
+        {
+            return GetNavSugarQueryable();
+        }
         private  NavISugarQueryable<T> GetNavSugarQueryable()
         {
             var result= new NavQueryableProvider<T>();
diff --git a/Src/Asp.NetCore2/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs b/Src/Asp.NetCore2/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs
index cacbc1924..04e94de08 100644
--- a/Src/Asp.NetCore2/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs
@@ -269,6 +269,7 @@ namespace SqlSugar
             var navEntity = navObjectNameColumnInfo.PropertyInfo.PropertyType.GetGenericArguments()[0];
             var navEntityInfo = this.Context.EntityMaintenance.GetEntityInfo(navEntity);
             var navColumn = navEntityInfo.Columns.FirstOrDefault(it => it.PropertyName == navObjectNameColumnInfo.Navigat.Name);
+            Check.ExceptionEasy(navColumn == null, $"{navEntityInfo.EntityName} not found {navObjectNameColumnInfo.Navigat.Name} ", $"实体 {navEntityInfo.EntityName} 未找到导航配置列 {navObjectNameColumnInfo.Navigat.Name} ");
             //var navType = navObjectNamePropety.PropertyType;
             var listItemPkColumn = listItemEntity.Columns.Where(it => it.IsPrimarykey).FirstOrDefault();
             Check.ExceptionEasy(listItemPkColumn == null, listItemEntity.EntityName + " not primary key", listItemEntity.EntityName + "没有主键");
diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/BinaryExpressionResolve.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/BinaryExpressionResolve.cs
index e8634d07e..c18557345 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/BinaryExpressionResolve.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/ResolveItems/BinaryExpressionResolve.cs
@@ -3,6 +3,8 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Text;
+using System.Text.RegularExpressions;
+
 namespace SqlSugar
 {
     public class BinaryExpressionResolve : BaseResolve
@@ -26,6 +28,13 @@ namespace SqlSugar
         {
             var expression = this.Expression as BinaryExpression;
             var operatorValue = parameter.OperatorValue = ExpressionTool.GetOperator(expression.NodeType);
+
+            if (IsGroupSubquery(expression.Right,operatorValue))
+            {
+                InSubGroupBy(expression);
+                return;
+            }
+
             var isEqual = expression.NodeType == ExpressionType.Equal;
             var isComparisonOperator = ExpressionTool.IsComparisonOperator(expression);
             base.ExactExpression = expression;
@@ -88,5 +97,56 @@ namespace SqlSugar
                 base.Context.Result.Append(" " + ExpressionConst.ExpressionReplace + parameter.BaseParameter.Index + " ");
             }
         }
+
+
+        private void InSubGroupBy(BinaryExpression expression)
+        {
+            var leftSql = GetNewExpressionValue(expression.Left);
+            var rightExpression = expression.Right as MethodCallExpression;
+            var selector = GetNewExpressionValue(rightExpression.Arguments[0]);
+            var rightSql = GetNewExpressionValue(rightExpression.Object).Replace("SELECT FROM", $"SELECT {selector} FROM");
+            if (this.Context.IsSingle&&this.Context.SingleTableNameSubqueryShortName==null)
+            {
+                var leftExp = expression.Left;
+                if (leftExp is UnaryExpression) 
+                {
+                    leftExp = (leftExp as UnaryExpression).Operand;
+                }
+                var p = (leftExp as MemberExpression);
+                this.Context.SingleTableNameSubqueryShortName=p.Expression.ToString();
+            }
+            base.Context.Result.Append($" {leftSql} in ({rightSql}) ");
+        }
+
+        private bool IsGroupSubquery(Expression rightExpression, string operatorValue)
+        {
+            if (operatorValue != "=")
+            {
+                return false;
+            }
+            if (rightExpression == null)
+            {
+                return false;
+            }
+            if ((rightExpression is MethodCallExpression) == false)
+            {
+                return false;
+            }
+            var method = (rightExpression as MethodCallExpression);
+            if (method.Method.Name != "Select")
+            {
+                return false;
+            }
+            var methodString = method.ToString();
+            if (methodString.IndexOf("GroupBy(")<=0) 
+            {
+                return false;
+            }
+            if (Regex.Matches(methodString, @"Subqueryable\(").Count!=1)
+            {
+                return false;
+            }
+            return true;
+        }
     }
 }
diff --git a/Src/Asp.NetCore2/SqlSugar/Interface/IIncludes.cs b/Src/Asp.NetCore2/SqlSugar/Interface/IIncludes.cs
index 1f982dbdd..83fd46554 100644
--- a/Src/Asp.NetCore2/SqlSugar/Interface/IIncludes.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Interface/IIncludes.cs
@@ -13,6 +13,7 @@ namespace SqlSugar
     /// <typeparam name="T"></typeparam>
     public partial interface ISugarQueryable<T>
     {
+        NavISugarQueryable<T> AsNavQueryable();
         ISugarQueryable<T> Includes<TReturn1>(Expression<Func<T, List<TReturn1>>> include1);
         ISugarQueryable<T> Includes<TReturn1>(Expression<Func<T, TReturn1>> include1);
         ISugarQueryable<T> Includes<TReturn1, TReturn2>(Expression<Func<T, List<TReturn1>>> include1, Expression<Func<TReturn1, List<TReturn2>>> include2);