当多个条件满足时,如何分组计算平均值

你可以使用 conditional aggregation 然后 unpivot 作为

   select prod_a as "Prod",
          prod as "Range of Amounts",
          value as "Mean Price"
     from  
            (
            with tablea(prod,amt,price) as
            (
              select 'X',100,1 from dual union all
              select 'X',180,2 from dual union all
              select 'X',250,3 from dual union all
              select 'Y',90, 2 from dual union all
              select 'Y',170,3 from dual union all
              select 'Y',280,3 from dual 
            )
            select prod as prod_a,  
            avg(case when amt between 0 and 200 then price end) as avg_0_200,
            avg(case when amt between 150 and 300 then price end) as avg_150_300
            from tablea a
            group by prod
             ) b  
    unpivot(value for prod in(avg_0_200,avg_150_300))
    order by prod_a;

   Prod  Range of Amounts   Mean Price
   ----  ----------------    ----------
   X     AVG_0_200              1.5
   X     AVG_150_300            2.5
   Y     AVG_0_200              2.5
   Y     AVG_150_300            3

Rextester Demo

使用单个条件进行两个查询,并将它们联合起来。这不是一个完美的解决方案,但会奏效。

SELECT prod, '0-200' rang, AVG( price )
FROM   table_name
WHERE  amt BETWEEN 0 AND 200
GROUP BY prod
UNION ALL
SELECT prod, '150-300' rang, AVG( price )
FROM   table_name
WHERE  amt BETWEEN 150 AND 300
GROUP BY prod