Tanvir - 4 days ago 5
SQL Question

# Finding out Percentage Value using Hive

I have some tables as:

``````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
``````

I have created a hive table before. Now, I want to come up with a single HiveQL so that, I can get the expected output from these above 3 tables.
What I am thinking to do is, in my query I will:

2. find the sum of "Total" and "Score" for each ID

3. divide sum of "Score" by sum of "Total" to get percentage.

I came up with this:

``````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);
``````

And, I am stuck at this point. Not sure how to reach to the result.
This is a simple `join`. Assuming you have one row per id in each of tables t2 and t3, you can do
``````SELECT t2.Student_ID AS ID, 100.0*(t2.score+t3.score)/(t2.total+t3.total) AS percent