num_rows()
modify_column($table, $field)
affected_rows()
update([$table = ''[, $set = NULL[, $where = NULL[, $limit = NULL]]]])
or_group_start()
unbuffered_row([$type = 'object'])
where($key[, $value = NULL[, $escape = NULL]])
$this->db->call_function(); This function enables you to call PHP database functions that are not natively included in CodeIgniter,
dbprefix([$table = ''])
group_start()
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