Introduction

This article will demonstrate how to quantify on a date axis the availability \ unavailability of products given only the start and end date of each product's availability (See data format in "ProductData,csv" table below).

Business Case

Viewing how many campaigns were available on a collection of dates, how many machines were running or how many products were available in a collection of dates. 

Example

Steps

To Achieve this we will be creating 3 tables in our ElastiCube:

1. ProductData: (ProductId, StartDate, EndDate) Source table, containing for each product its ID and availability date
2. AllDates: (ProductId, dates) Custom table, holds a Cartesian product of all dates given (StartDate and EndDate values) multiplied be all products
   
3. Availability: (dates, avail, notavail) For each date it holds the number of available products and the number of unavailable products 

1. Add your data in a similar format of ProductData. Make note of the column names as we will be referring to them in the next steps.
2. To create AllDates table either:
    - Import a table into the elasticube containing all dates in the rance and rename it to "AllDates" - this is the preffered method
   OR
   - Add a custom table with the following dynamic script (changing table and column names accordingly) - this is the less-preferred method as it may result in 'holes' in the timeline if some dates values are not imported originally 
   
   

   SELECT o.ProductId, c.dates
   FROM [productData.csv] o,	
   	(SELECT a.StartDate dates
   	FROM [productData.csv] a
   	UNION
   	SELECT b.EndDate
   	FROM [productData.csv] b) c
   ORDER BY o.ProductId desc

 
3. To create Availability table add a custom table with the following script (changing table and column names accordingly):

   SELECT DISTINCT a.dates, res1.avail, res2.notavail
   FROM [AllDates] a,
   	 (SELECT a.dates, count(b.ProductId) avail
   	  FROM [AllDates] a, 
   	  [productData.csv]b
   	  WHERE a.ProductId = b.ProductId
   	  AND a.dates <= b.EndDate
   	  AND a.dates >= b.StartDate
   	  GROUP BY a.dates
   	  ) res1,
   	 (SELECT a.dates, count(b.ProductId) notavail
   	  FROM [AllDates] a, 
   	  [productData.csv]b
   	  WHERE a.ProductId = b.ProductId
   	  AND (a.dates > b.EndDate
   	  or a.dates < b.StartDate)
   	  GROUP BY a.dates
   	  ) res2
   WHERE a.dates = res1.dates
   AND a.dates = res2.dates
   

 
4. In Sisense web, add a new Columns Widget and choose in the right pane a "Stacked" display
5. Create calculated measure "SUM([Notavail])" and name "Not Available". Similarly create "SUM([avail]) and name "Available". Pick your colors and you are good to go!