diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/SubqueryableN.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/SubqueryableN.cs
index e7f246728..00b1f9006 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/SubqueryableN.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/SubqueryableN.cs
@@ -317,6 +317,10 @@ namespace SqlSugar
         {
             return default(string);
         }
+        public TResult Sum<TResult>(Func<T1, T2,T3,T4, TResult> expression)
+        {
+            return default(TResult);
+        }
     }
     public class Subqueryable<T1, T2, T3> : Subqueryable<T1> where T1 : class, new()
     {
@@ -409,6 +413,10 @@ namespace SqlSugar
         {
             return default(string);
         }
+        public TResult Sum<TResult>(Func<T1, T2,T3, TResult> expression)
+        {
+            return default(TResult);
+        }
     }
     public class Subqueryable<T1, T2> : Subqueryable<T1> where T1 : class, new()
     {
@@ -497,5 +505,9 @@ namespace SqlSugar
         {
             return default(string);
         }
+        public TResult Sum<TResult>(Func<T1, T2, TResult> expression)
+        {
+            return default(TResult);
+        }
     }
 }