Question

I have the table categories:

categories_id | categories_status | parent_id
     1                  1               0
     2                  1               0
     3                  0               1
     4                  0               2
     5                  1               1
     6                  0               2

How can i select and update the status of the categories where all child categories having status = 0 (in this example it’s just the categories_id 2)? I need to integrate this in PHP.

Thanks in advance,

Alex

Answer 1

update categories,
(
  select parent_id, sum(categories_status) as cnt
  from categories
  where parent_id!=0
  group by parent_id
  having cnt=0 
) as child_cat
set ? = ?   /* what do you want to update? */
where categories.categories_id=child_cat.parent_id

Likely you don’t have to use PHP, a SQL will do.