php - 求帮助，各位大神，这条sql如何优化!!!

Question

1. 语句如下：

    select
    tb1.*,
    tb2.name as ad_name,
    tb3.name as media_name
    from ( 
        select 
        `day`, 
        hourly, 
        ad_id, 
        media_id, 
        count(*) AS winnotice, 
        IFNULL(SUM(cost), 0) AS cost, 
        IFNULL(budget, 0) AS budget 
        from
        pmp_report_hourly_ad 
        WHERE 1=1 
        AND `day` = '2017-03-17'
        AND status=1 
        AND type = 0 
        GROUP BY ad_id,media_id,hourly
        ORDER BY `day` DESC, hourly ASC
    ) tb1
    LEFT JOIN pmp_config_ads tb2 ON tb1.ad_id = tb2.id
    LEFT JOIN pmp_config_media tb3 ON tb3.id = tb1.media_id

2.索引如下：

Answer 1

好长，感觉在做阅读理解题，再贴个执行计划会更好。

看到pmp_report_hourly_ad这个表建了好多索引，而且都只覆盖一个字段，不如建一个索引，覆盖type、status、day、ad_id、media_id、hourly 。

Answer 2

不要用子查询的表做join操作~~查询的时候可以在表后面加上(NOLOCK)，优化查询速度！