Question

表A有2014年的数百万条记录，使用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

表B

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

我希望6个月的总和以及ID 1开始时的1年总和表B中的日期为 22/11/2014

Output Sales_Amount_6Months Sales_Amount_6Months
1               70                 130

在这种情况下，我应该使用add_months吗？

Answer 1

是的，您可以使用ADD_MONTHS()和条件聚合：

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

两个表上的SQL聚合

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