This works:
$sql = "SELECT id
FROM `users`
WHERE `account_status` = '" . $i . "'";
$query = $this->db->query($sql);
var_dump($query->num_rows());
But this doesn't:
$sql = "SELECT COUNT(*)
FROM `users`
WHERE `account_status` = '" . $i . "'";
$query = $this->db->query($sql);
var_dump($query->num_rows());
How to do a num_rows on a COUNT(*) query? Also is doing it the 2nd way any better performance wise?
This question is related to
php
mysql
codeigniter
Doing a COUNT(*) will only give you a singular row containing the number of rows and not the results themselves.
To access COUNT(*) you would need to do
$result = $query->row_array();
$count = $result['COUNT(*)'];
The second option performs much better since it does not need to return a dataset to PHP but instead just a count and therefore is much more optimized.