显示选择日期范围内第一天的记录，选择日期范围内结束的日期。日期范围可以是任何日期

Question

我需要显示用户输入日期范围内的库存和关闭库存。

对于开放式库存，它应该在选定日期范围的第一天取库存，而关闭库存的它应该在选定日期范围的结束日期取库存。

假设我有1月3日至1月30日的数据（在数据库中）和用户已选择日期范围（1月1日至1月31日），因此在开放式库存中应显示< [1月3日的库存，并在接近的库存中显示1月30日的库存

如何在SAP HANA Studio中执行此操作？

Answer 1

对源数据的外观进行猜测。我试图解决您的问题。

with data as (
--here are some example data
select to_date('2019-12-31','yyyy-mm-dd') d ,-1 stock from dual union all
select to_date('2020-01-03','yyyy-mm-dd') d ,1 stock from dual union all
select to_date('2020-01-04','yyyy-mm-dd') d ,2 stock from dual union all
select to_date('2020-01-30','yyyy-mm-dd') d ,3 stock from dual union all
select to_date('2020-02-01','yyyy-mm-dd') d ,2 stock from dual 
)
,filt_data as (
select * from data
where d between to_date('2020-01-01','yyyy-mm-dd') and to_date('2020-01-31','yyyy-mm-dd')
)
, min_date as(
select min(d) d from filt_data
)
, max_date as(
select max(d) d from filt_data
)
select (select d from filt_data where d = (select d from min_date)) open_stock_date
      ,(select stock from filt_data where d = (select d from min_date)) open_stock
      ,(select d from filt_data where d = (select d from max_date)) close_stock_date
      ,(select stock from filt_data where d = (select d from max_date)) close_stock
from  dual ;

Answer 2

以下查询可能会满足您的需求：

SELECT 
 MAX(CASE WHEN S.dateStock = DT.minDate THEN S.dateStock END) AS openDate,
 MAX(CASE WHEN S.dateStock = DT.minDate THEN S.value END) AS openStock,
 MAX(CASE WHEN S.dateStock = DT.maxDate THEN S.dateStock END) AS closeDate,
 MAX(CASE WHEN S.dateStock = DT.maxDate THEN S.value END) AS closeStock
FROM
 stock S
JOIN(
 SELECT 
  min(dateStock) as minDate, 
  max(dateStock) as maxDate
 FROM stock 
 WHERE dateStock BETWEEN '2020-01-01' AND '2020-01-31'
) DT ON S.dateStock = DT.minDate OR S.dateStock = DT.maxDate

SEE DEMO HERE