Update demo

Src/Asp.Net/MySqlConnectorTest/Demo/Demo1_Queryable.cs

@@ -86,6 +86,11 @@ namespace OrmTest
             var test05 = db.Queryable<Order>().Where(it => it.CreateTime.Month == dp.Month).ToList();
             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 test03 = db.Queryable<Order>().Select(it => new
+            {
+                names = SqlFunc.Subqueryable<Order>().Where(z => z.Id == it.Id).SelectStringJoin(z => z.Name, ",")
+            })
+       .ToList();
             Console.WriteLine("#### Examples End ####");
         }
 

Src/Asp.Net/MySqlTest/Demo/Demo1_Queryable.cs

@@ -90,6 +90,11 @@ namespace OrmTest
             var q1 = db.Queryable<Order>().Take(1);
             var q2 = db.Queryable<Order>().Take(2);
             var test02 = db.Union(q1, q2).ToList();
+            var test03 = db.Queryable<Order>().Select(it => new
+            {
+                names = SqlFunc.Subqueryable<Order>().Where(z => z.Id == it.Id).SelectStringJoin(z => z.Name, ",")
+            })
+          .ToList();
             Console.WriteLine("#### Examples End ####");
         }
 

Src/Asp.Net/OracleTest/Demo/Demo1_Queryable.cs

@@ -63,6 +63,11 @@ namespace OrmTest
             var test06 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Hour, DateTime.Now, DateTime.Now.AddHours(3))).ToList();
             var test07 = db.Queryable<Order>().Select(it => it.CreateTime.DayOfWeek.ToString()).ToList();
             var test08 = db.Queryable<Order>().Select(it => it.CreateTime.AddDays(1)).ToList();
+            var test09 = db.Queryable<Order>().Select(it => new
+            {
+                names = SqlFunc.Subqueryable<Order>().Where(z => z.Id==188||z.Id==190).SelectStringJoin(z => z.Name, ",")
+            })
+            .ToList();
             Console.WriteLine("#### Examples End ####");
         }
 

Src/Asp.Net/PgSqlTest/Demo/Demo1_Queryable.cs

@@ -54,6 +54,11 @@ namespace OrmTest
             var test06 = db.Queryable<Order>().
               Where(it => it.Price == 0 ? true : it.Name == it.Name)
               .ToList();
+            var test07 = db.Queryable<Order>().Select(it => new
+            {
+                names = SqlFunc.Subqueryable<Order>().Where(z=>z.Id==it.Id).SelectStringJoin(z => z.Name, ",")
+            })
+            .ToList();
             Console.WriteLine("#### Examples End ####");
             Console.WriteLine("#### Examples End ####");
         }

Src/Asp.Net/SqliteTest/Demo/Demo1_Queryable.cs

@@ -51,6 +51,11 @@ namespace OrmTest
             var test04 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Second, DateTime.Now, DateTime.Now.AddMinutes(2))).ToList();
             var test05 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Minute, DateTime.Now, DateTime.Now.AddMinutes(21))).ToList();
             var test06 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Hour, DateTime.Now, DateTime.Now.AddHours(3))).ToList();
+            var test07 = db.Queryable<Order>().Select(it => new
+            {
+                names = SqlFunc.Subqueryable<Order>().Where(z => z.Id == it.Id).SelectStringJoin(z => z.Name, ",")
+            })
+         .ToList();
             Console.WriteLine("#### Examples End ####");
         }