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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