Re: SQL sum function to store as single variable

Your SQL syntax in incorrect.

Try:
SELECT SUM(customerpurchases.amount) AS total From customerpurchases
WHERE customerbill_id = $billid

This can be written as a find():
$total = $this->CustomerPurchases->find('first', array('conditions'=>array('customerbill_id'=>$billid), 'fields'=>array('sum(customerpurchases.amount) as total'));

If you then do a debug($total)  you will get something like:

Array  (      [0] => Array          (              [$total] => <some_number>          )    )

Using find() instead query() gives all kinds of benefits like increased 
security and the ability to use the Containable behavior properly.

Try to follow the conventions.

HTH,
Ken

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