Question

我在mysql中有两个表（shop_details，预订）

shop_details

id      shop_id     open_time       close_time
1       1           09:00Am         09:00Pm
2       5           10:00Am         09:00Pm

预订

id      shop_id     start_time      end_time
1       1           10:30am         11:10Am
1       5           02:00pm         02:45pm

现在，我想了解一下shop_id（1），那么我想每半小时获取预订时间（开店时间之后）和可利用的时间（直到商店关闭），例如，我想要跟踪结果

shop_id     start_time      end_time    status
1           09:00am         09:30am     avaliable
1           09:30am         10:00am     avaliable
1           10:00am         10:30am     avaliable
1           10:30am         11:10am     booked
1           11:10am         11:40am     avaliable
...
1           08:30am         09:00pm     booked

Answer 1

您需要一个时间列表-然后您可以使用join或相关子查询来获取信息：

select t.tme,
       (case when exists (select 1
                          from booking b
                          where b.start_time <= t.tme and
                                b.end_time > t.tme
                         )
             then 'booked' else 'available'
        end) as status
from (select cast('00:00' as time) as tme union all
      select cast('00:30' as time) as t union all
      select cast('01:00' as time) as t union all
      . . .
      select cast('23:50' as time) as t
     ) t join
     (select sd.*
      from shop_details sd
      where sd.shop_id = 1
     ) sd1
     on t.tme >= sd1.open_time and
        t.tme <= sd1.close_time;

Answer 2

首先，使用while函数创建一个循环，该循环将重复执行代码直到达到关闭时间为止，在while函数中，您可以使用IF语句根据日期确定可用性状态

好运

在SQL中获取可用时间和预订时间

2 个答案: