php - To Get Structured Data mysql -


i need requirement below can please assist me depending on parent_id , id relation

 id | category_name | parent_id    1    electronics         0           2    computer            1   3    ram                 2   4    fashion             0   5    tshirt              4   6     round neck         5

i need requirement below

category name     |      sub category     |      sub sub category  |   electronics                na                        na  electronics                computer                  na  electronics                computer                  ram  fashion                    na                        na  fashion                    tshirt                    na  fashion                    tshirt                   round neck

please

after few hours of pain , suffering, arrived @ following query. note links given comments above did nothing me.

select t.* (     select coalesce(c3.category_name, c2.category_name, c1.category_name, 'na') `category name`,         case when c3.category_name not null             c2.category_name             else                 case when c2.category_name not null                     c1.category_name                     else 'na'                 end          end `sub category`,         case when c3.category_name not null             c1.category_name             else 'na'         end `sub sub category`     category c1 left join category c2         on c1.parent_id = c2.id     left join category c3         on c2.parent_id = c3.id ) t order t.`category name`,     case when t.`sub category` = 'na' null else t.`sub category` end,     case when t.`sub sub category` = 'na' null else t.`sub sub category` end

follow link below running demo:

sqlfiddle


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