Hive - Unpivot functionality in hive

Question

I have two table as follows:

Table A

userid | code | code_name | property_id
0001   | 1    | apple_id  | Y1234
0031   | 4    | mango_id  | G4567
0008         


        

Answer 1

You actually dont need to unpivot to get the result.

SELECT * FROM 
(
    SELECT userid,
        CASE WHEN property_id = apple_id THEN new_id  
             WHEN property_id = mango_id THEN new_id  
             WHEN property_id = grape_id THEN new_id  
             WHEN property_id = peach_id THEN new_id
        END AS newid
    FROM
    (SELECT * FROM a FULL JOIN b) X
) y
WHERE newid IS NOT NULL;

Result:

y.userid  y.newid
1         N456098
31        N002345
8         N129087
13        N109876