Query samples on a self referenced table (Part-2)

In previous post we created a database table, filled it with sample data and saw some basic queries.

In this post we will query the table in { Menu.Title, IEnumerable<menu> } form. This will show Top menu title and sub menu items in a row.

Linq

var menus = from t in Menus 
 where t.MenuType==1 
 select new {
  t.Title,
  SubMenus = from s in Menus
  where t.MenuType==1 && t.MenuID==s.MenuParent
  select s
 };

Lambda

Menus
   .Where (t => (t.MenuType == 1))
   .Select (
      t => 
         new  
         {
            Title = t.Title, 
            SubMenus = Menus
               .Where (s => ((t.MenuType == 1) && ((Int32?)(t.MenuID) == s.MenuParent)))
         }
   )

SQL

DECLARE @p0 Int = 1
DECLARE @p1 Int = 1

SELECT [t0].[Title], [t1].[MenuID], [t1].[Title] AS [Title2], [t1].[Url], [t1].[MenuParent], [t1].[MenuType], (
    SELECT COUNT(*)
    FROM [Menu] AS [t2]
    WHERE ([t0].[MenuType] = @p0) AND (([t0].[MenuID]) = [t2].[MenuParent])
    ) AS [value]
FROM [Menu] AS [t0]
LEFT OUTER JOIN [Menu] AS [t1] ON ([t0].[MenuType] = @p0) AND (([t0].[MenuID]) = [t1].[MenuParent])
WHERE [t0].[MenuType] = @p1