MySQL优化-防止子查询

我是否可以更改此查询，以便将

计数（其中type\u id=2）作为成功，将计数（其中type\u id=1）作为错误来防止使用子查询

SELECT
                (SELECT COUNT(id) FROM log AS success_log WHERE type_id = 2 AND site_id = site.id AND DAYOFYEAR(success_log.created)) AS success,
                (SELECT COUNT(id) FROM log AS success_log WHERE type_id = 1 AND site_id = site.id AND DAYOFYEAR(success_log.created)) AS error,
                (SELECT COUNT(id) FROM log AS success_log WHERE site_id = site.id AND DAYOFYEAR(success_log.created)) AS total,
                DATE_FORMAT(log.created, "%m-%d-%y") AS `day`
            FROM log
            WHERE site_id = ?
            GROUP BY DAYOFYEAR(created)`

您可以将single count与GroupBy TypeId一起使用，并将它们插入临时表，然后选择所需的方式。
您可以将single count与GroupBy TypeId一起使用，并将它们插入临时表，然后选择所需的方式。
因为它们都是从同一站点的日志表中查询的，您只需在表中运行一次，然后在sum中应用并立即执行IF（）测试。。。。如果记录为给定类型，则计数为1，否则为0。。。获取类型1或类型2的总和，简单计数（*）获取所述日期的总计数

SELECT
      DATE_FORMAT(log.created, "%m-%d-%y") AS `day`,
      sum( if( type_id = 2, 1, 0 )) as NumberSuccess,
      sum( if( type_id = 1, 1, 0 )) as NumberError,
      count(*) as TotalRecords
   from
      log
   where
      site_id = ?
   group by
      DAYOFYEAR(created)

因为它们都是从同一站点的日志表中查询的，所以您可以只运行一次该表，然后在sum中应用并立即执行IF（）测试。。。。如果记录为给定类型，则计数为1，否则为0。。。获取类型1或类型2的总和，简单计数（*）获取所述日期的总计数

SELECT
      DATE_FORMAT(log.created, "%m-%d-%y") AS `day`,
      sum( if( type_id = 2, 1, 0 )) as NumberSuccess,
      sum( if( type_id = 1, 1, 0 )) as NumberError,
      count(*) as TotalRecords
   from
      log
   where
      site_id = ?
   group by
      DAYOFYEAR(created)

查看sum（如果…）或sum（当…语法时的情况）查看sum（如果…）或sum（当…语法时的情况