Question

我在Hive中做了一些相对简单的查询，似乎无法将GROUP BY和ORDER BY组合在一个语句中。我可以选择GROUP BY查询的临时表，然后使用ORDER BY对该表进行选择，但我无法将它们组合在一起。

例如，我有一个表a并且可以执行此查询：

SELECT place,count(*),sum(weight) from a group by place;

我可以执行此查询：

create temporary table result (place string,count int,sumweight int);
insert overwrite table result 
      select place,count(*),sum(weight) from a group by place;
select * from result order by place;

但是如果我尝试这个查询：

SELECT place,count(*),sum(weight) from a group by place order by place;

我收到此错误：

错误：编译语句时出错：FAILED：ParseException line 1:45输入''期待''在'_c0'附近的字符串文字（state = 42000，code = 40000）

Answer 1

尝试使用group by作为子查询，使用order by作为外部查询，如下所示：

SELECT 
    place, 
    cnt, 
    sum_ 
FROM (
    SELECT 
        place, 
        count(*) as cnt, 
        sum(weight) as sum_ 
    FROM a 
    GROUP BY place
) a 
ORDER BY place;

Answer 2

像这样使用sort by：

SELECT place,count(*),sum(weight) from a group by place sort by place;

HIVE SELECT可以结合GROUP BY和ORDER BY吗？

2 个答案: