mysql - 将两个查询与计数函数合并为一个结果集

Question

我的 mySQL 数据库中有两个表

Table 1 [Orders]
DateOpened (date), 
revenue

Table 2 [Movements]
DateStarted (date), 
DateStopped (date)

对于任何给定日期，表 1 中可能有 0 个或多个条目，而对于表 2，DateStarted 或 DateStopped 可能有 0 个或多个条目( DateStarted 和 DateStopped 可以是同一天，也可以是不同)

我想查询这些表的日期范围(例如:一个月)，并获取包含以下形式的一些数据的每个日期的结果集:

date, sum(revenue), num_orders (count of orders for the date), num_movements (count of movements for the date)

我创建了两个单独的查询来完成每个部分，但我不知道如何组合它们，以便我可以实现单个有效的查询，而不必在代码中合并结果集。我似乎很困惑的是 count() 函数是否正确应用。

以下是现有的有效查询:

select count(*) as total_movements, movement_date
from (
    select dropoffdate as movement_date
    from bb_movement
    where (dropoffdate >= '2013-01-01' and dropoffdate <= '2013-06-30') 
    union all
    select pickupdate as movement_date
    from bb_movement
    where (pickupdate >= '2013-01-01' and pickupdate <= '2013-06-30')
) as t3
group by movement_date
order by movement_date asc

select count(*) as num_orders, sum(order_amount) as revenue, dateopened as date_opened
from bb_order
where (dateopened >= '2013-01-01' and dateopened <= '2013-06-30') 
group by dateopened
order by dateopened asc

如果不存在则创建表bb_movement ( movementid int(10) 无符号 NOT NULL AUTO_INCRMENT, orderid int(10) 无符号非空注释 dropoffdate 日期不为空， pickupdate 日期 NOT NULL )

如果不存在则创建表bb_order ( orderid int(10) 无符号 NOT NULL AUTO_INCRMENT, movementid int(10) 无符号 NOT NULL, dateopened 日期不为空， order_amount float NOT NULL DEFAULT '0' }

Answer 1

已解决:它需要将源表与主选择中的适当聚合函数进行联合

 SELECT mv_date, sum(mv_count), sum(order_count), sum(order_revenue)
FROM (
    select dateopened as mv_date, 0 as mv_count, count(*) as order_count, sum(order_amount) as order_revenue
    from bb_order
    where (dateopened >= '2013-01-01' and dateopened <= '2013-06-30')
    group by mv_date
    union all
    SELECT dropoffdate AS mv_date, COUNT( * ) AS mv_count, 0 as order_count, 0 as order_revenue
    FROM bb_movement
    WHERE (dropoffdate >=  '2013-01-01' AND dropoffdate <=  '2013-06-30')
    group by mv_date
    UNION  all
    SELECT pickupdate AS mv_date, COUNT( * ) AS mv_count, 0 as order_count, 0 as order_revenue
    FROM bb_movement
    WHERE (pickupdate >=  '2013-01-01' AND pickupdate <=  '2013-06-30')
    group by mv_date
 ) mv
group by mv_date
order by mv_date