我必须可视化“预计缺货”项目及其在库存中缺货的日期。
我有一张桌子,显示什么时候该物品可能缺货。该表显示一周中每个星期一的预计库存。
Item Location Projected Inventory Date
A1 L1 0 Aug 20, 2018
A1 L1 0 August 27, 2018
A1 L1 54 Sep 03,20-18
A1 L1 49 Sep 10, 2018
A1 L1 44 Sep 17
A1 L1 39 Sep 24
A1 L1 32 Oct 1
A1 L1 25 Oct 8
A1 L1 18 Oct 15
A1 L1 12 Oct 22
A1 L1 5 Oct 29
A1 L1 55 Nov 5
A1 L1 45 Nov 12
如果有Projected Invenotry<20
,则该商品被视为缺货。由于数据是一周中的每个星期一的数据,因此该项目可能要花几周的时间才能重新库存(即PI > 20
)。
从表中可以看出,物料A1于2018年8月20日断货,并于2018年9月3日恢复库存。所需的输出表是:
Item Location PI Date Out of Stock
A1 L1 0 Aug 20, 2018
A1 L1 18 Oct 15, 2018
这对我来说很复杂。任何帮助将不胜感激。
关于, 普赖瓦尔
答案 0 :(得分:0)
您可以使用(MySQL 8.0 +):
WITH cte AS (
SELECT *, SUM(CASE WHEN Projected < 20 THEN 0 ELSE 1 END)
OVER(PARTITION BY Item, Location ORDER BY Inventory_Date) AS subgrp
FROM tab
), cte2 AS (
SELECT *, ROW_NUMBER()
OVER(PARTITION BY Item, Location, subgrp ORDER BY Inventory_Date) AS rn
FROM cte
)
SELECT *
FROM cte2
WHERE (Item, Location, subgrp,rn) IN (SELECT Item, Location, subgrp, MIN(rn)
FROM cte2 c
WHERE Projected < 20
GROUP BY Item, Location, subgrp)
ORDER BY Inventory_Date;
它将选择每组20以下的第一个值,该值由Item / Location / Streak_of_values_below_20组成。
答案 1 :(得分:0)
尝试一下:
select @lag := 0;
select item, location, projected, `date` from (
select @lag projectedLag, @lag:=projected,
item, location, projected, `date`
from tab
order by `date`
) a where projectedLag >= 20 and projected < 20