Question

我有一个包含以下字段的表

ReservationID   int
ReservationDateFrom datetime
ReservationDateTo   datetime
ReservationRoom int
ReservationPurpose  varchar
ReservationDetailsID    int

我想创建一个sp，用于选择可用记录和不可用记录（如果至少30分钟）给定日期（必填），房间（可选），TimeFrom（可选），TimeTo（如果TimeFrom不为空则需要）示例表

ReservationID ReservationDateFrom      ReservationDateTo        ReservationRoom     ReservationPurpose ReservationDetailsID
3002         2017-01-02 00:00:00.000    2017-01-02 02:00:00.000     14              qweqwe              3002
3003         2017-01-02 04:00:00.000    2017-01-02 05:00:00.000     14              qweqwe              3002
3004         2017-01-02 06:00:00.000    2017-01-02 08:00:00.000     14              eqweq               3002
3005         2017-01-02 08:30:00.000    2017-01-02 09:30:00.000     14              iuyiyi              3002
3006         2017-01-02 09:50:00.000    2017-01-03 11:00:00.000     14              qweqwe              3003

要选择的结果（显示不可用且可用的房间和范围）

ReservationID ReservationDateFrom      ReservationDateTo        ReservationRoom     ReservationPurpose ReservationDetailsID
3002         2017-01-02 00:00:00.000    2017-01-02 02:00:00.000     14              qweqwe              3002
3003         2017-01-02 04:00:00.000    2017-01-02 05:00:00.000     14              qweqwe              3002
3004         2017-01-02 06:00:00.000    2017-01-02 08:00:00.000     14              eqweq               3002
3005         2017-01-02 08:30:00.000    2017-01-02 09:30:00.000     14              iuyiyi              3002
3006         2017-01-02 09:50:00.000    2017-01-03 11:00:00.000     14              qweqwe              3003
             2017-01-02 02:00:00.000    2017-01-02 04:00:00.000     14                              
             2017-01-02 05:00:00.000    2017-01-02 06:00:00.000     14                              
             2017-01-02 08:00:00.000    2017-01-02 08:30:00.000     14              
             2017-01-02 11:00:00.000    2017-01-03 24:00:00.000     14

Answer 1

您可以添加＆＃34;无保留＆＃34;使用lead()（或lag()）的记录。基本思路是：

select ReservationID, ReservationDateFrom, ReservationDateTo,         ReservationRoom 
from reservations r
where . . .
union all
select NULL, ReservationDateTo,
       lead(ReservationDateFrom) over (partition by ReservationRoom),
       ReservationRoom
from reservations r
where . . .;

这并不能准确生成您指定的输出。但我不清楚某些逻辑来自何处，尤其是最后一行。

如果输入日期，房间（可选）

1 个答案: