标签： postgresql
我正在计算最近30天总订单与最近60天总订单之间的差额
select count(s1.order_id) from sales_sale s1 full outer join sales_saleitem s2 on s2.order_id=s1.id WHERE (s1.date_created > current_date - interval '60' day) - (s1.date_created > current_date - interval '30' day )