How to use GROUP_CONCAT with Zend Framework?

Question

Assume that I have a table : students

______________________________________________________
|id   | name           | school        | class        |
________         


        

Answer 1

Zend Expression gave me problems, the easiest way for me was:

$select->from($this,
    array(
         'listings.*',
         '(SELECT GROUP_CONCAT(DISTINCT ecg.listing_cat_name,"*|*",ecg.listing_cat_id SEPARATOR "-|-") FROM listings_cats AS ecg 
LEFT JOIN listings_to_listings_cats ON listings_to_listings_cats.listing_cat_id=ecg.listing_cat_id
WHERE listings_to_listings_cats.listing_id=listings.listing_id
LIMIT 7 ) AS catGrouping'))

Here I'm concatenating a list of category names and ids, which I explode in my search results and print a list of clickable child categories per parent record. You can obviously add further Joins and other conditions to the from() as the above will be treated as a sub query.