Question

我想运行一个查询，该查询计算每张信用卡每个月的最大花费。对于每张信用卡，我将需要计算每月花费的总金额。我有一个表格，其中包含信用卡credit_transact的交易：

processdate timestamp   ""
cardno_hash string  ""
amount  int ""
year    int ""
month   int ""

弥补样本数据：

card    year    month    amount
a123    2016    12       23160
a123    2016    10       287
c123    2016    11       5503
c123    2016    11       4206

我想要：

card    year    month    amount
a123    2016    12       23160
c123    2016    11       9709

重要的是年份和月份是分区列。

我尝试了如下子查询：

USE credit_card_db;
SELECT sum_amount_transact.cardno_hash, sum_amount_transact.year, sum_amount_transact.month, MAX(sum_amount_transact.sum_amount)
FROM
(
  SELECT cardno_hash, year, month, SUM(amount) AS sum_amount FROM credit_transact
  GROUP BY cardno_hash, year, month
) AS sum_amount_transact
GROUP BY sum_amount_transact.cardno_hash, sum_amount_transact.year;

但是，显示以下错误：

java.lang.Exception: org.apache.hive.service.cli.HiveSQLException: Error while compiling statement: FAILED: SemanticException Line 0:-1 Invalid column reference 'month'

以下子查询工作正常，并按预期返回结果：

SELECT cardno_hash, year, month, SUM(amount) AS sum_amount FROM credit_transact
  GROUP BY cardno_hash, year, month

结果是：

card    year    month    amount
a123    2016    12       23160
a123    2016    10       287
c123    2016    11       9709

如果有人可以帮助解决此问题，将非常感谢。

Answer 1

我不太清楚你真正想要什么，但是我很确定你想要row_number()。我想您想要每年最多的月份：

SELECT ct.*
FROM (SELECT cardno_hash, year, month, SUM(amount) AS sum_amount,
             ROW_NUMBER() OVER (PARTITION BY cardno_hash, year ORDER BY SUM(amount) DESC) as seqnum
      FROM credit_transact
      GROUP BY cardno_hash, year, month
     ) ct
WHERE seqnum = 1;

配置单元：错误计算总和然后分组项目的最大值

1 个答案: