$commentary_e_alert_query = db_select('commentary_e_alert', 'c');
$commentary_e_alert_query->fields('c');
$commentary_e_alert_query->condition('uid',$user->uid,'=');
$commentary_e_alert_query->addExpression('MAX(timestamp)');
$commentary_e_alert_result = $commentary_e_alert_query->execute();
$commentary_e_alert_result = $commentary_e_alert_result->fetchAssoc();
请问上面那里错了？
发现如果把 $commentary_e_alert_query->addExpression('MAX(timestamp)'); 去掉就没错
但我就需要这功能
