如何计算5天的总价格（mysql）酒店预订系统

Question

我有这张表来查询不同季节（高，低）季节的房间价格

如何获得不同天数和不同季节的5天总价..

看这张表

这是我的命令（mysql）我想从 2013年4月7日* 到 2013年 11月7日获得10晚的总价格 *

select sum(
case when dayname('2013-01-07') = 'Monday' then coalesce(prices.room_price , def.room_price) 
 when dayname('2013-01-07') = 'Sunday' then coalesce(prices.room_price , def.room_price)

)as TotalPrice 
from (select strtodate('2013-01-07' , '%Y-%m-%d') as thedate 
select strtodate('2013-01-08' , '%Y-%m-%d') as thedate ) dates left outer join ts_room_prices prices
on dates.thedate between prices.season_start and prices.season_end cross join ts_room prices def on def.season_name = 'default'

添加

我写了这个命令，但是还是没用

select sum(coalesce(prices.room_price , def.room_price) ) as TotalPrice
from (select strtodate('2013-01-07' , '%Y-%m-%d') as thedate union all
      select strtodate('2013-01-08' , '%Y-%m-%d') as thedate
     ) dates left outer join
     ts_room_prices prices
     on dates.thedate between prices.season_start and prices.season_end and
        dayname(dates.thedate) = prices.dayofweek join ts_room_prices def
    on def.season_name = 'default' and
       def.hotel = 3233 and
       def.dayofweek = dayname(dates.thedate)

错误：＃1305-功能saudihot_saudihotels.strtodate不存在

Answer 1

这是查询：

select sum(coalesce(prices.room_price , def.room_price) ) as TotalPrice
from (select strtodate('2013-01-07' , '%Y-%m-%d') as thedate union all
      select strtodate('2013-01-08' , '%Y-%m-%d') as thedate
     ) dates left outer join
     ts_room_prices prices
     on dates.thedate between prices.season_start and prices.season_end and
        dayname(dates.thedate) = prices.dayofweek join ts_room prices def
    on def.season_name = 'default' and
       def.hotel = <whatever the hotel is> and
       def.dayofweek = dayname(dates.thedate)

注意，sum()表达式要简单得多，现在星期几在联接中。我还添加了获取默认值的酒店条件-这也应该在其他查询中。

请记住，您必须将所有日期与组合在一起放入初始子查询中union all。