Split support no table query

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

@@ -35,6 +35,12 @@ namespace OrmTest
                 .SplitTable(tabs => tabs.Take(3))
                 .Where(it=>it.Time==DateTime.Now).ToOffsetPage(1,2);
 
+            var first = db.Queryable<OrderSpliteTest>()
+      .SplitTable(DateTime.MaxValue, DateTime.Now)
+      .First();//no table
+
+
+
             Console.WriteLine();
 
             //根据时间选出的表进行查询

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

@@ -35,6 +35,12 @@ namespace OrmTest
                 .SplitTable(tabs => tabs.Take(3))
                 .Where(it=>it.Time==DateTime.Now).ToOffsetPage(1,2);
 
+
+            var first = db.Queryable<OrderSpliteTest>()
+          .SplitTable(DateTime.MaxValue, DateTime.Now)
+          .First();//no table
+
+
             Console.WriteLine();
 
             //根据时间选出的表进行查询

Src/Asp.Net/SqlServerTest/Demo/DemoN_SplitTable.cs

@@ -36,6 +36,11 @@ namespace OrmTest
                 .SplitTable(DateTime.Now.Date.AddYears(-1),DateTime.Now)
                 .ToList();
 
+            var first = db.Queryable<OrderSpliteTest>()
+          .SplitTable(DateTime.MaxValue, DateTime.Now)
+          .First();//no table
+
+
             Console.WriteLine();
 
             //根据时间选出的表进行查询

Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs

@@ -509,6 +509,11 @@ namespace SqlSugar
         }
         public string GetSqlQuerySql(string result)
         {
+            if (GetTableNameString == " (-- No table ) t  ")
+            {
+                result = "-- No table ";
+                return result;
+            }
             if (this.IsSqlQuery&&this.OldSql.HasValue() && (Skip == null && Take == null) && (this.WhereInfos == null || this.WhereInfos.Count == 0))
             {
                 return this.OldSql;