php - How to display data in a tree structure basen on column values -


i've table structure :

enter image description here

and want display data in following format :

a     1     2     3      a1         4         5      a1         a2             6             7  b     8     9

i'm using php mysql , i'm not able think how query db.

you can begin following query:

select * yourtable order category_1,          coalesce(category_2, ''),          coalesce(category_3, '')

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