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-- Преобразовать таблицу в вид: Level1, Level2, Level3, Level4 with products as ( select 'Appliances' as Category, 1 as ID, NULL as ParentID union all select 'Home Appliances', 2, 1 union all select 'Vacuum Cleaners', 3, 2 union all select 'Robotic Vacuum Cleaners', 4, 3 union all select 'Food', 5, NULL union all select 'Milk Products', 6, 5 union all select 'Milk', 7, 6 union all select 'Health and Beauty Equipment', 8, 1 union all select 'Massage Equipment and Accessories', 9, 8 union all select 'Massage Pillows', 10, 9 union all select 'Household Chemicals', 11, NULL union all select 'Dishwasher Products', 12, 11 union all select 'Dishwasher Tablets', 13, 12 ) select * from products