Question

我有一个具有以下结构的表

    UpdateDate                Rate      
    2015-08-26 00:00:00.000   310.000000    
    2016-06-02 00:00:00.000   310.000000
    2017-02-01 00:00:00.000   310.000000
    2017-09-15 00:00:00.000   320.000000
    2018-01-31 00:00:00.000   310.000000
    2018-02-16 00:00:00.000   310.000000
    2018-02-23 00:00:00.000   310.000000
    2018-03-09 00:00:00.000   310.000000
    2018-04-15 00:00:00.000   320.000000

我正在通过FromDate作为报告标准。

我只想获取“ FromDate”条件后“比率”字段大于先前比率的那些行。

例如，如果我通过2018-04-01作为FromDate选择标准，那么我将得到以下输出，因为2018-04-15的速率大于2018-03-09的速率

    2018-04-15 00:00:00.000   320.000000

但是如果我将2018-05-01作为FromDate参数传递，那么我将不会得到任何输出
价格从2018-05-01直到今天都没有更新。

谢谢。

Answer 1

这使用窗口功能：

declare @test table ([UpdateDate] datetime, [Rate] Decimal(9,6))
insert into @test values
      ('2015-08-26 00:00:00.000', 310.000000)    
    , ('2016-06-02 00:00:00.000', 310.000000)
    , ('2017-02-01 00:00:00.000', 310.000000)
    , ('2017-09-15 00:00:00.000', 320.000000)
    , ('2018-01-31 00:00:00.000', 310.000000)
    , ('2018-02-16 00:00:00.000', 310.000000)
    , ('2018-02-23 00:00:00.000', 310.000000)
    , ('2018-03-09 00:00:00.000', 310.000000)
    , ('2018-04-15 00:00:00.000', 320.000000)

declare @date as date = '2018-04-01'
;with cte1 as (select [UpdateDate], [Rate], iif(lag(Rate) OVER (ORDER BY [UpdateDate]) < [Rate], 1, 0) as [Changed] from @test),
cte2 as (Select top 1 * from cte1 where [UpdateDate] > @date order by [UpdateDate])
select [UpdateDate], [Rate] from cte2 where [Changed] = 1

set @date = '2018-03-01'
;with cte1 as (select [UpdateDate], [Rate], iif(lag(Rate) OVER (ORDER BY [UpdateDate]) < [Rate], 1, 0) as [Changed] from @test),
cte2 as (Select top 1 * from cte1 where [UpdateDate] > @date order by [UpdateDate])
select [UpdateDate], [Rate] from cte2 where [Changed] = 1

Answer 2

谢谢，已经解决了。

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