[英]selecting max values grouped by two column
我有一个像这样的简单表
firstname, lastname , nb_payments
a, b , 10
a, b , 20
b, a , 30
b, a , 40
b, b , 50
我想选择按夫妇名字,姓氏分组的3笔最高付款额
所需的输出是这样的
firstname, lastname , top3
b, a , 70
b, b , 50
a, b , 30
我做了这个查询: SELECT firstname, lastname , nb_payments as top3 FROM account ORDER BY nb_payments DESC LIMIT 3
但它并没有添加按夫妻名字,姓氏分组的nb_payments
任何帮助将不胜感激,非常感谢
您需要按firstname
和lastname
对付款和分组进行firstname
SELECT firstname, lastname , SUM(nb_payments)
FROM account
GROUP BY firstname, lastname
ORDER BY 3 DESC LIMIT 3
我认为这会产生你想要的输出:
select firstname, lastname, sum(nb_payments)
from (select t.*,
row_number() over (partition by firstname, lastname
order by nb_payments desc) as seqnum
from table t
) t
where seqnum <= 3
group by firstname, lastname;
如果有帮助,这就是我在oracle中写的方式。 还有其他方法。
select * from(
SELECT firstname, lastname , sum(nb_payments) as top3 FROM test group by firstname,lastname ORDER BY top3 desc )
where rownum <=3
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