kalis kalis - 29 days ago 7
SQL Question

SQL Aggregate on Two tables

Table A has millions of records from 2014, Using Oracle

ID Sales_Amount Sales_Date
1 10 20/11/2014
1 10 22/11/2014
1 10 22/12/2014
1 10 22/01/2015
1 10 22/02/2015
1 10 22/03/2015
1 10 22/04/2015
1 10 22/05/2015
1 10 22/06/2015
1 10 22/07/2015
1 10 22/08/2015
1 10 22/09/2015
1 10 22/10/2015
1 10 22/11/2015


Table B

ID ID_Date
1 22/11/2014
2 01/12/2014


I want sum of totals for 6 months as well as 1 year for ID 1 taking starting

date from Table B as 22/11/2014

Output Sales_Amount_6Months Sales_Amount_6Months
1 70 130


Shall I use
add_months
in this case?

Answer

Yes, you can use ADD_MONTHS() and conditional aggregation :

SELECT b.id,
       SUM(CASE WHEN a.sales_date between b.id_date AND ADD_MONTHS(b.id_date,6) THEN a.sales_amount ELSE 0 END) as sales_6_month,
       SUM(CASE WHEN a.sales_date between b.id_date AND ADD_MONTHS(b.id_date,12) THEN a.sales_amount ELSE 0 END) as sales_12_month
FROM TableB b
JOIN TableA a
 ON(b.id = a.id)
GROUP BY b.id