diff --git a/Src/Asp.Net/MySqlTest/Demo/Demo1_Queryable.cs b/Src/Asp.Net/MySqlTest/Demo/Demo1_Queryable.cs
index f919b048a..e5a9de22a 100644
--- a/Src/Asp.Net/MySqlTest/Demo/Demo1_Queryable.cs
+++ b/Src/Asp.Net/MySqlTest/Demo/Demo1_Queryable.cs
@@ -87,6 +87,9 @@ namespace OrmTest
             var fromatList = db.Queryable<Order>().Select(it => it.CreateTime.ToString("%Y-%m")).ToList();
             var test06 = db.Queryable<Order>().Where(it => it.CreateTime.Date.Day >= DateTime.Now.Date.Day).ToList();
             var test07 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Day, Convert.ToDateTime("2021-1-1"), Convert.ToDateTime("2021-1-12"))).ToList();
+            var q1 = db.Queryable<Order>().Take(1);
+            var q2 = db.Queryable<Order>().Take(2);
+            var test02 = db.Union(q1, q2).ToList();
             Console.WriteLine("#### Examples End ####");
         }
 
diff --git a/Src/Asp.Net/SqlSugar/Abstract/SugarProvider/SqlSugarProvider.cs b/Src/Asp.Net/SqlSugar/Abstract/SugarProvider/SqlSugarProvider.cs
index 15c911db9..a00b50a22 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/SugarProvider/SqlSugarProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/SugarProvider/SqlSugarProvider.cs
@@ -557,9 +557,9 @@ namespace SqlSugar
                 string sql = sqlObj.Key;
                 UtilMethods.RepairReplicationParameters(ref sql, sqlObj.Value.ToArray(), i, "Union");
                 if (sqlObj.Value.HasValue())
-                    allItems.Add(new KeyValuePair<string, List<SugarParameter>>(sql, sqlObj.Value));
+                    allItems.Add(new KeyValuePair<string, List<SugarParameter>>($" ( {sql} ) ", sqlObj.Value));
                 else
-                    allItems.Add(new KeyValuePair<string, List<SugarParameter>>(sql, new List<SugarParameter>()));
+                    allItems.Add(new KeyValuePair<string, List<SugarParameter>>($" ( {sql} ) ", new List<SugarParameter>()));
                 i++;
             }
             var allSql = sqlBuilder.GetUnionSql(allItems.Select(it => it.Key).ToList());