Question

我有一些表格：

Table_1:
+------------+--------------+
| Student_ID | Student_Name |
+------------+--------------+
|        000 | Jack         |
|        001 | Ron          |
|        002 | Nick         |
+------------+--------------+

Table_2:
+-----+-------+-------+
| ID  | Total | Score |
+-----+-------+-------+
| 000 |   100 |    80 |
| 001 |   100 |    80 |
| 002 |   100 |    80 |
+-----+-------+-------+

Table_3:
+-----+-------+-------+
| ID  | Total | Score |
+-----+-------+-------+
| 000 |   100 |    60 |
| 001 |   100 |    80 |
| 002 |   100 |    70 |
+-----+-------+-------+

Expected_Output：

ID  percent
000 70
001 80
002 75

我之前创建了一个配置单元表。现在，我想提出一个单独的HiveQL，以便我可以从上面3个表中获得预期的输出。我想要做的是，在我的查询中，我将：

使用ID
为每个ID
将“得分”之和除以“总数”之和得到百分比。

我想出了这个：

INSERT OVERWRITE TABLE expected_output 
SELECT t1.Student_ID AS ID, (100*t4.SUM1/t4.SUM2) AS percent
FROM Table_1 t1
LEFT OUTER JOIN(
SELECT (ISNULL(Total,0) + ISNULL(Total,0)) AS ‘SUM2’, (ISNULL(Score,0) + ISNULL(Score,0)) AS ‘SUM1’
FROM t4
)ON (t1.Student_ID=t2.ID) JOIN Table_3 t3 ON (t3.ID=t2.ID);

而且，我现在陷入困境。不确定如何达到结果。有什么好主意吗？

Answer 1

这是一个简单的join。假设在每个表t2和t3中每个id都有一行，你可以做

SELECT t2.Student_ID AS ID, 100.0*(t2.score+t3.score)/(t2.total+t3.total) AS percent
FROM Table_2 t2
JOIN Table_3 t3 ON t3.ID=t2.ID

使用Hive查找百分比值

1 个答案: