的Transact SQL - 插入所有日期与指定的差距在几分钟

Question

我有合适的房间

DECLARE @tblSuitableRooms TABLE 
(
    RoomID BIGINT PRIMARY KEY NOT NULL, 
    StartTime DATETIME NULL, 
    EndTime DATETIME NULL, 
    RoomStartTime DATETIME NULL, 
    RoomEndTime DATETIME NULL, 
    RoomStartTimeCaretaker DATETIME NULL, 
    RoomEndTimeCaretaker DATETIME NULL 
) 

表，需要插入行@tblPossiblyAvailable表

DECLARE @tblPossiblyAvailable TABLE 
(
    RoomID BIGINT NOT NULL, 
    StartTime DATETIME NOT NULL, 
    Processed BIT NOT NULL 
) 

与差距固定的分钟数（@AdvancedSearchInterval）。我已经在表中使用RoomStartTimes

INSERT INTO @tblPossiblyAvailable 
SELECT sr.RoomID, sr.RoomStartTime, 0 
FROM @tblSuitableRooms sr 
WHERE sr.RoomStartTime IS NOT NULL 

但现在我需要在一个特定的分钟数（AdvancedSearchInterval）的间隔与RoomStartTime和RoomEndTime之间的开始时间，以插入@tblPossiblyAvailable更多的记录。这将允许我检查一天的房间供应情况。

我需要的是这样的事情

RoomID开始时间
1 2013年2月26日09:00:00
1 2013年2月26日09:30:00
1 2013-02- 26 10:00:00
1 2013年2月26日10点30分零零秒
1 2013年2月26日11:00:00
2 2013年2月26日八时00分00秒
2 2013- 02-26 08:30:00
2 2013-02-26 09:00:00
2 2013-02-26 09:30:00
2 2013年2月26日10:00:00
3 2013年2月26日09:00:00
3 2013年2月26日09:30:00

我需要的东西就像一个循环说

insert into @tblPossiblyAvailable 
select each room from @tblSuitableRooms 
and take the start time for the room, 
then take the start time + 30 minutes and insert that with the RoomID, 
then take the last time inserted + 30 minutes and insert that with the RoomID 
then take the last time inserted + 30 minutes and insert that with the RoomID 
... 

非常感谢您的任何帮助。

埃德

附：我正在使用SQL Server 2000

此解决方案似乎正常工作。任何人都可以想到一个更好的方法去实现它，我会非常感兴趣。

DECLARE @AdvancedSearchInterval tinyint 
DECLARE @tblSuitableRooms TABLE 
(
    RoomID BIGINT PRIMARY KEY NOT NULL, 
    StartTime DATETIME NULL, 
    EndTime DATETIME NULL, 
    RoomStartTime DATETIME NULL, 
    RoomEndTime DATETIME NULL, 
    RoomStartTimeCaretaker DATETIME NULL, 
    RoomEndTimeCaretaker DATETIME NULL 
) 
DECLARE @tblPossiblyAvailable TABLE 
(
    RoomID BIGINT NOT NULL, 
    StartTime DATETIME NOT NULL, 
    Processed BIT NOT NULL 
) 

SET @AdvancedSearchInterval = 30 

INSERT INTO @tblSuitableRooms 
select 1, getdate(), getdate(), '2013-02-26 08:00:00', '2013-02-26 17:00:00', getdate(), getdate() 
UNION ALL 
select 2, getdate(), getdate(), '2013-02-26 10:00:00', '2013-02-26 19:00:00', getdate(), getdate() 
UNION ALL 
select 3, getdate(), getdate(), '2013-02-26 09:00:00', '2013-02-26 17:00:00', getdate(), getdate() 

DECLARE @mins INT 
SET @mins = 0 
WHILE @mins < 1440 
    BEGIN 
    INSERT INTO @tblPossiblyAvailable 
    SELECT RoomID, DATEADD(MINUTE,@mins,RoomStartTime), 0 
    FROM @tblSuitableRooms 
    WHERE DATEADD(MINUTE,@mins,RoomStartTime) < RoomEndTime 

    SET @mins = @mins + @AdvancedSearchInterval 
END 

SELECT * 
FROM @tblPossiblyAvailable 
ORDER BY StartTime 

Answer 1

我可以建议为MS SQL 2000的替代解决方案，而无需使用循环：

SET NOCOUNT ON; 

DECLARE @SearchInterval TINYINT 
SELECT @SearchInterval = 30 

DECLARE @SuitableRooms TABLE 
(
     RoomID BIGINT 
    , RoomStartTime DATETIME 
    , RoomEndTime DATETIME 
) 

INSERT INTO @SuitableRooms (RoomID, RoomStartTime, RoomEndTime) 
SELECT 1, '2013-02-26 08:00:00', '2013-02-26 17:00:00' 
    UNION ALL 
SELECT 2, '2013-02-26 10:00:00', '2013-02-26 19:00:00' 
    UNION ALL 
SELECT 3, '2013-02-26 09:00:00', '2013-02-26 17:00:00' 

DECLARE @emun TABLE (i BIGINT IDENTITY, blank BIT) 
INSERT INTO @emun (blank) 
SELECT 1 
FROM [master].dbo.spt_values n 
CROSS JOIN (
    SELECT i = 1 
     UNION ALL 
    SELECT 2 
) b 

SELECT r.RoomID, StartTime = DATEADD(MINUTE, i, RoomStartTime) 
FROM (
    SELECT i = 0 

    UNION ALL 

    SELECT i 
    FROM @emun 
    WHERE i % @SearchInterval = 0 
) d 
CROSS JOIN @SuitableRooms r 
WHERE DATEADD(MINUTE, i, RoomStartTime) < RoomEndTime 
ORDER BY StartTime 

对于MS SQL版本> 2000（非常可悲的是MS SQL 2000不支持CTE）：

SET NOCOUNT ON; 

DECLARE @SearchInterval TINYINT 
SELECT @SearchInterval = 30 

;WITH emun AS 
(
    SELECT 
      RoomID 
     , StartTime 
     , EndTime 
    FROM (
     SELECT 
       RoomID = 1 
      , StartTime = CAST('2013-02-26 08:00:00' AS DATETIME) 
      , EndTime = '2013-02-26 17:00:00' 

      UNION ALL 

     SELECT 2, '2013-02-26 10:00:00', '2013-02-26 19:00:00' 
      UNION ALL 
     SELECT 3, '2013-02-26 09:00:00', '2013-02-26 17:00:00' 
    ) d 

    UNION ALL 

    SELECT 
      RoomID 
     , StartTime = DATEADD(MINUTE, @SearchInterval, StartTime) 
     , EndTime 
    FROM emun 
    WHERE DATEADD(MINUTE, @SearchInterval, StartTime) < EndTime 
) 

SELECT RoomID, StartTime 
FROM emun 
ORDER BY StartTime