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如何产生连续时间?(案例)

原问题如下：

Insus.NET的问题解决，分2步，1，创建一个辅助表，2，合并数据。

程式码搜寻出来如图：

IF OBJECT_ID(N'TEMPDB.DBO.#search_data') IS NOT NULL
DROP TABLE #search_data
GO
 
CREATE TABLE #search_data ([times] DATETIME,[val] INT)
 
INSERT INTO #search_data ([times],[val]) VALUES
('2001-01-01 00:00:00',13),
('2001-01-01 00:10:00',22),
('2001-01-01 00:20:00',31),
('2001-01-01 00:40:00',5 ),
('2001-01-01 00:50:00',64),
('2001-01-01 02:30:00',73),
('2001-01-01 04:10:00',63),
('2001-01-01 04:50:00',12),
('2001-01-01 06:30:00',32)

Source Code

接下来，我们可以创建一张辅助表：

DECLARE @start_datetime DATETIME = '2000-01-01 00:00:00',
        @end_datetime DATETIME  = '2000-02-01 00:00:00'

;WITH DTs([times]) 
AS
(
    SELECT  @start_datetime
    UNION ALL
    SELECT [times] = DATEADD(MINUTE,10, [times])
    FROM [DTs]
    WHERE [times] < @end_datetime
)
SELECT [times] FROM [DTs] OPTION (MaxRecursion 0)

Source Code

总共产生4465行记录。

为了更好操作，把辅助表的产生数据存入一张临时表中：

IF OBJECT_ID(N'TEMPDB.DBO.#base') IS NOT NULL
    DROP TABLE #base
GO
 
CREATE TABLE #base ([times] DATETIME)

DECLARE @start_datetime DATETIME = '2000-01-01 00:00:00',
        @end_datetime DATETIME  = '2000-02-01 00:00:00'
;WITH DTs([times]) 
AS
(
    SELECT  @start_datetime
    UNION ALL
    SELECT [times] = DATEADD(MINUTE,10, [times])
    FROM [DTs]
    WHERE [times] < @end_datetime
)

INSERT INTO #base ([times]) SELECT [times] FROM [DTs] OPTION (MaxRecursion 0)

Source Code

第2步，合并数据，把程序搜索结果与辅助表的数据进行合并merge:

MERGE #search_data AS Target
    USING (SELECT [times] FROM #base) AS Source
    ON (Target.[times] = Source.[times])
 
    WHEN NOT MATCHED BY TARGET THEN
        INSERT ([times],[val]) VALUES ([times],0);  

SELECT [times],[val] FROM #search_data

Source Code

OK，实现方法仅供参考，完整代码：

IF OBJECT_ID(N'TEMPDB.DBO.#search_data') IS NOT NULL
DROP TABLE #search_data
GO
 
CREATE TABLE #search_data ([times] DATETIME,[val] INT)
 
INSERT INTO #search_data ([times],[val]) VALUES
('2001-01-01 00:00:00',13),
('2001-01-01 00:10:00',22),
('2001-01-01 00:20:00',31),
('2001-01-01 00:40:00',5 ),
('2001-01-01 00:50:00',64),
('2001-01-01 02:30:00',73),
('2001-01-01 04:10:00',63),
('2001-01-01 04:50:00',12),
('2001-01-01 06:30:00',32)
 
 
 
IF OBJECT_ID(N'TEMPDB.DBO.#base') IS NOT NULL
    DROP TABLE #base
GO
 
CREATE TABLE #base ([times] DATETIME)

DECLARE @start_datetime DATETIME = '2000-01-01 00:00:00',
        @end_datetime DATETIME  = '2000-02-01 00:00:00'
;WITH DTs([times]) 
AS
(
    SELECT  @start_datetime
    UNION ALL
    SELECT [times] = DATEADD(MINUTE,10, [times])
    FROM [DTs]
    WHERE [times] < @end_datetime
)

INSERT INTO #base ([times]) SELECT [times] FROM [DTs] OPTION (MaxRecursion 0)



MERGE #search_data AS Target
    USING (SELECT [times] FROM #base) AS Source
    ON (Target.[times] = Source.[times])
 
    WHEN NOT MATCHED BY TARGET THEN
        INSERT ([times],[val]) VALUES ([times],0);  

SELECT [times],[val] FROM #search_data

Source Code

正文到此结束

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本文标签： 他山之玉
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