從計數蜂巢

Question

獲得百分比我有一個表，如下所示：

COL1 COL2 DATETIMESTAMP CATEGORY1 CATEGORY2 
e-12 1101 201408110525 Arts and Entertainment Television 
e-12 1101 201408110525 Arts and Entertainment Television 
e-12 1101 201408110525 Arts and Entertainment Television 
e-12 1101 201408110620 Technology and Computing Internet Technology 
e-12 1101 201408110705 Technology and Computing Antivirus Software 
e-12 1107 201408110510 Business Advertising 
e-12 1107 201408110520 Business Marketing 
e-12 1107 201408110520 Business Marketing 
e-12 1107 201408110520 Business Marketing 
e-12 1107 201408110520 Business Marketing 
e-12 1107 201408110520 Business Marketing 
e-12 1107 201408110520 Business Marketing 
e-12 1107 201408110520 Business Marketing 
e-12 1109 201408110505 Technology and Computing Web Search 

忽視COL1（因爲他們都是一樣的），爲每一位COL2，有其餘字段的組合。我設法重複組合的數量，從而產生以下：

COL1 COL2 DATETIMESTAMP CATEGORY1 CATEGORY2 COUNT 
e-12 1101 201408110525 Arts and Entertainment Television 3 
e-12 1101 201408110620 Technology and Computing Internet Technology 1 
e-12 1101 201408110705 Technology and Computing Antivirus Software 1 
e-12 1107 201408110510 Business Advertising 1 
e-12 1107 201408110520 Business Marketing 7 
e-12 1109 201408110505 Technology and Computing Web Search 1 

如何轉數爲每COL2所有組合的百分比是多少？

我很抱歉，我不能更好地把這個詞，但輸出應該是這樣的：

COL1 COL2 DATETIMESTAMP CATEGORY1 CATEGORY2 COUNT PERCENTAGE 
e-12 1101 201408110525 Arts and Entertainment Television 3 60% 
e-12 1101 201408110620 Technology and Computing Internet Technology 1 20% 
e-12 1101 201408110705 Technology and Computing Antivirus Software 1 20% 
e-12 1107 201408110510 Business Advertising 1 12.5% 
e-12 1107 201408110520 Business Marketing 7 87.5% 
e-12 1109 201408110505 Technology and Computing Web Search 1 100% 

注：在這一點上，計數是沒有必要的。

這甚至可能在蜂巢？我如何修改我的計數查詢（下）以輸出最後一個表？

SELECT COL1, COL2, DATETIMESTAMP, CATEGORY1, CATEGORY2, count(*) FROM temp_table GROUP BY CATEGORY1, CATEGORY2, DATETIMESTAMP, COL2, COL1 SORT BY COL2; 

謝謝。

Answer 1

我可以考慮幾種方法來做到這一點。您可以計算您的百分比中的分母，然後將其加回到原始數據中，然後除以總數得到SUM。此外，如果您有權訪問Hive中的windowing functions（我相信它們的發貨時間爲0.13），則可以使用SELECT中的OVER和PARTITION語句來避免第一部分中描述的聯接。

＃1：

select col2, cat1, cat2, datetimestamp 
    ,(COUNT(cat2)/MAX(total_)) as perc 
from (
    select n.col2, cat1, cat2, datetimestamp, x.total_ 
    from some_table as n 
    JOIN (
     select col2, COUNT(col2) as total_ 
     from some_table 
     group by col2 
     ) x 
    ON x.col2 = n.col2 
    ) y 
group by cat1, cat2, col2, datetimestamp 

＃2：

select col2, cat1, cat2, datetimestamp 
    ,(COUNT(col2)/MAX(total)) as perc 
from (
    select col2, cat1, cat2 
     ,COUNT(cat1) OVER (PARTITION BY col2) as total 
    from some_table 
    ) x 
group by cat1, cat2, col2, datetimestamp