mysql按日期分组tp5.0和原生写法

原生

SELECT  DATE_FORMAT(create_time,'%Y-%m-%d') as date,AVG(num) as avg,MAX(num) as max FROM `on_line`
WHERE server_id=2000 AND create_time>'2018-10-26' AND create_time<'2018-10-30'
GROUP BY DATE_FORMAT(create_time,'%Y-%m-%d')

tp5.0

    $Online = new Online_Model;
    $date_s = '2018-10-27';
    $date_e = '2018-10-30';
    $map['create_time']  = ['>',$date_s];
    $map['create_time']  = ['<',$date_e];
    $map['server_id']  = 4001;
    $Online->where($map);
    $Online->field(['server_id',"DATE_FORMAT(create_time,'%Y-%m-%d')"=>'date',"AVG(num)"=>'avg',"MAX(num)" => 'max']);
    $Online->group("DATE_FORMAT(create_time,'%Y-%m-%d')");
    $row = $Online->select();