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。

更多相关辅助表,可以参考《使用CTE生成辅助表(数字或时间)等https://www.cnblogs.com/insus/p/10946112.html 和《快速生成基数的辅助表https://www.cnblogs.com/insus/p/10946112.html

 

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

 

posted @ 2019-06-14 23:01 Insus.NET 阅读(...) 评论(...) 编辑 收藏