SQL 查询 - 最小的情况 - 到今天的最近日期

Question

我有一张包含客户协议列表的表格[source.Agreements]。
一个客户可以有多个具有不同[Agreement End Date]的协议

我需要获取最接近的[Agreement End Date]，然后将其分配给[Agreement Window]

例如：

如果在 1 月 - 6 月之间，则：

[Agreement Window] = FY H2

如果在 7 月 - 12 月之间，那么：

[Agreement Window] = FY H1。

财政年度 = ([Agreement End Date] - 1 年)

示例：

ID 有 [Agreement End Date] = 2020-06-30。所以，[Agreement Window] = 'FY19 H2'。

但是，如果ID 有多个[Agreement End Date]，并且第二个日期在 7 月到 12 月之间，它会使用该日期而不是 MIN 日期。

示例：（见下图）

ID 1789 有三个[Agreement End Date] = '2018-05-31', '2018-09-30', '2019-03-30'。
它应该返回：

2017 财年下半年

但它会返回

2017 财年上半年

我在下面包含了我尝试过的查询。我想我需要第二个 MIN 声明，但不知道如何使用 CASE 声明。

DECLARE @dtDate DATE
SET @dtDate = GETDATE();

select A.ID 
    ,min(case when AgreementEndDate>=@dtDate then AgreementEndDate else '' end) as 'Agreement End Date'
    ,min(case when AgreementEndDate>=@dtDate  and ((month(AgreementEndDate) >= 7 and month(AgreementEndDate) <= 12))  THEN 'FY' + convert(varchar(2),(FORMAT(AgreementEndDate, 'yy') - 1)) + ' H1'
              when AgreementEndDate>=@dtDate  and ((month(AgreementEndDate) >= 1 and month(AgreementEndDate) <= 6))   THEN 'FY' + convert(varchar(2),(FORMAT(AgreementEndDate, 'yy') - 1)) + ' H2'
        else null end) as 'Agreement Window'
from source.Agreements A
where A.ID IN ('1740','1789','7582645','2387732')
group by A.ID

Answer 1

这个怎么样：

DECLARE @dtDate DATE

SET @dtDate = GETDATE();

WITH cte
AS (
    SELECT *, ROW_NUMBER() OVER (
            PARTITION BY ID ORDER BY AgreementEndDate ASC
            ) AS RowNum
    FROM [source].[dbo].Agreements A
    WHERE A.ID IN ('1740', '1789', '7582645', '2387732')
    )
SELECT ID
    , CASE WHEN AgreementEndDate >= @dtDate THEN AgreementEndDate ELSE '' END AS 'Agreement End Date'
    , CASE WHEN AgreementEndDate >= @dtDate AND ((month(AgreementEndDate) >= 7 AND month(AgreementEndDate) <= 12)) THEN 'FY' + convert(VARCHAR(2), (FORMAT(AgreementEndDate, 'yy') - 1)) + ' H1' 
    WHEN AgreementEndDate >= @dtDate AND ((month(AgreementEndDate) >= 1 AND month(AgreementEndDate) <= 6)) THEN 'FY' + convert(VARCHAR(2), (FORMAT(AgreementEndDate, 'yy') - 1)) + ' H2' 
    ELSE NULL 
    END AS 'Agreement Window'
FROM cte
WHERE RowNum = 1

表格内容及结果如图：