Question

select (
    SELECT SUM(countNumber) from(
            SELECT FROM_UNIXTIME(unix_timestamp(AddTime),'yyyy-MM-dd') AS dateTime,
                   COUNT(productID) AS countNumber
              FROM product
             GROUP BY FROM_UNIXTIME(unix_timestamp(AddTime),'yyyy-MM-dd')
           ) as bb
     where aa.dateTime >= bb.dateTime
   ) as totalCount,
   aa.countNumber,
   aa.dateTimefrom (
    SELECT FROM_UNIXTIME(unix_timestamp(AddTime),'yyyy-MM-dd')AS dateTime,
           COUNT(productID) AS countNumber
      FROM product
     GROUP BY FROM_UNIXTIME(unix_timestamp(AddTime),'yyyy-MM-dd')
   ) aa order by dateTime desc limit 10000;

我不想查询每日累计数量。为什么此HQL无法使用？Hive引擎提示：

FAILED: ParseException line 2:8 cannot recognize input near 'SELECT' 'SUM' '(' in expression specification

Answer 1

Hive不允许将子查询作为列。要获取累计数量，请使用窗口函数sum。

SELECT dateTime,countNumber,SUM(countNumber) OVER(order by dateTime) as cumsum
FROM (SELECT FROM_UNIXTIME(unix_timestamp(AddTime),'yyyy-MM-dd') AS dateTime,
      COUNT(productID) AS countNumber
      FROM product
      GROUP BY FROM_UNIXTIME(unix_timestamp(AddTime),'yyyy-MM-dd')
     ) t

为什么此子查询hiveql不起作用？

1 个答案: