快速生成基数的辅助表

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)
 

 

 

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)

 

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》 和《快速生成基数的辅助表》

 

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)

 

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

 

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