SQL-根据SUM条件选择记录数

Question

如果您有订单表，则可以选择金额总和小于$ 1000的所有记录，假设该表已按金额desc进行了排序示例：

id product_id amount
1  1          500
2  3          400
3  2          300
4  1          200

获取所有金额小于$ 1000的订单，则它应返回1和2，因为金额1和2的总和为900 <1000

获取总金额小于$ 1300的所有订单，则应返回1,2,3，因为1,2,3的总和为1200 <1300

Answer 1

您正在寻找一个累加的总和：

select t.*
from (select t.*, sum(t.amount) over (order by t.amount desc) as cume_amount
      from t
     ) t
where cume_amount < 1000;

Answer 2

with a as ( 
    select  sum(amount) over (order by amount desc ) as amount_1 from test_order
)
select * from a where amount_1 < 1000;