MySQL保留查询，

Question

我有两个表：

|| *id* || *calendar_type* || *event_name* || *event_details* || *start_date* || *end_date* || *closed_date* || *time_start* || *time_end* ||
|| 1 || OPEN || AVAILABLE BLOCK || _NULL_ || 2013-01-01 || 2013-12-31 || 0000-00-00 || 08:00:00 || 08:59:00 ||
|| 2 || OPEN || AVAILABLE BLOCK || _NULL_ || 2013-01-01 || 2013-12-31 || _NULL_ || 09:00:00 || 09:59:00 ||
|| 3 || OPEN || AVAILABLE BLOCK || _NULL_ || 2013-01-01 || 2013-12-31 || _NULL_ || 10:00:00 || 10:59:00 ||
|| 4 || OPEN || AVAILABLE BLOCK || _NULL_ || 2013-01-01 || 2013-12-31 || _NULL_ || 13:00:00 || 13:59:00 ||

和一个Appointment_Calendar表：该表保存可用时间段和已关闭时间段的日期和时间。

|| *id* || *start_time* || *duration_min* || *customer_id* || *consignee* || *trucker_name* || *email* || *phone* || *pallet_total* || *freight_type* || *notes* || *reserved_on* || *is_cancelled* ||
|| 1 || 2013-01-22 09:00:00 || 01:00:00 || 0 ||  || Testing ||  ||  || 20 || DELIVERY || this is a test || 2013-01-22 19:15:06 || 0 ||
|| 2 || 2013-01-22 10:00:00 || 01:00:00 || 0 ||  || Trucker 2 ||   ||  || 12 || DELIVERY ||  || 2013-01-22 19:16:37 || 0 ||
|| 4 || 2013-01-23 08:00:00 || 01:00:00 || 0 ||  || Trucker 3 ||  ||  || 10 || DELIVERY ||  || 2013-01-22 20:32:18 || 0 ||

现在，我的目标是编写一个查询（可能是两个查询），以获取所有可用块的列表（来自pointation_calendar），并仅返回未在约会中（未保留）或在特定日期未关闭的那些时间。 下面的SQL可以做到这一点，但是当我引入一个子查询来忽略所有约会日期或时间（见注释掉的段）时，所有可用的subscription_calendar块都会消失。 我希望只显示可用的时间段

SELECT DATE('2013-01-23 08:00:00')as today,appointment_calendar.*
FROM appointment_calendar 
WHERE calendar_type='OPEN'
AND
 DATE( '2013-01-23 08:00:00') BETWEEN start_date AND end_date
AND
 DATE( '2013-01-23 08:00:00') 
  NOT IN (SELECT closed_date  FROM appointment_calendar WHERE calendar_type='CLOSED')

/*  This does not work somehow if the time is in the appointment all blocks for that day do not appear
AND
( TIMESTAMP('2013-01-23 08:00:00')  
    NOT IN  (SELECT TIMESTAMP( start_time) FROM appointments )
)
*/

有什么建议的方法吗？

Answer 1

被注释掉的部分将始终评估为true或false。 因此，它要么过滤掉所有行，要么不过滤任何行。 您需要以某种方式将“ TIMESTAMP（'2013-01-23 08:00:00'）'替换为ational_calendar表中的时间戳。 也许根据start_date和time_start做一个时间戳？