group concat - PHP MySQL Hierarchy Data group_concat -

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any amazing. got following mysql query:

select    group_concat( sp.`slug` separator  '/' )      `category` sn,  `category` sp     sn.lft between sp.`lft` , sp.`rgt`    , sn.`id` =3  order    sp.`lft` asc;

without group_concat function returns desired results in correct order. apply group_contact order mashed , incorrect. know how rewrite query give me concatenated result desired , in correct order?

im @ loss on this. on side note know how rewrite using "inner join" statements opposed 2 table names quoted next each other dont understand how joining 2 tables.

try this:

select    group_concat( sp.`slug` order  sp.`lft` asc separator  '/' )      `category` sn, inner join  `category` sp    on sn.lft between sp.`lft` , sp.`rgt`       sn.`id` =3

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