HiveQL 中的 AVG - 当我尝试获取列的平均值时出错

Question

我正在尝试获取每个 StationID（我的数据库中的一列来自 table s）的总温度平均值（我的数据库中的一列来自 table w） ).

我的查询：

SELECT s.zipcode AS Zipcode, AVG(w.precip) AS Preciptation FROM stationData s JOIN weatherReport w ON s.stationid = w.stationid;

错误：

Your query has the following error(s):
OK FAILED: SemanticException [Error 10025]: Line 1:7 Expression not in GROUP BY key 'zipcode'
ok failed: semanticexception [error 10025]: line 1:7 expression not in group by key 'zipcode'

Answer 1

您需要关于 Zipcode 的 GROUP BY 子句，因为您在 Precipitation

上使用聚合函数

SELECT s.zipcode AS Zipcode, AVG(w.precip) AS Preciptation 
FROM stationData s 
JOIN weatherReport w ON s.stationid = w.stationid
GROUP BY s.zipcode

Answer 2

如果使用 AVG()，则需要对查询进行分组。

试试：

SELECT s.zipcode AS Zipcode, AVG(w.precip) AS Preciptation FROM stationData s JOIN weatherReport w ON s.stationid = w.stationid group by s.zipcode;

HiveQL 中的 AVG - 当我尝试获取列的平均值时出错

AVG in HiveQL - Error when I try to get the average of columns

mysql

sql

hive

hiveql