Rows to Columns in One Line

Question

I have these 3 tables
TABLE1
ID DRUG1
1     10     
2     20     
3     40     
4     50     
TABLE2
ID DRUG2
1     20     
3     30     
4     40     
5     50     
TABLE3
ID DRUG3
1     30     
2     30     
3     50     
6     60     
My Output Table should be:
ID Drug1 Drug2 Drug3
1 10 20 30
2 20 NULL 30
3 40 30 50
4 50 40 NULL
5 NULL 50 NULL
6 NULL NULL 60
Can someone please help me constructing this SQL.
Regards
Murali

Answer 1

WITH TABLE1 AS
    SELECT 1 AS id, 10 AS drug1 FROM dual UNION ALL
    SELECT 2, 20 FROM dual UNION ALL
    SELECT 3, 40 FROM dual UNION ALL
    SELECT 4, 50 FROM dual
TABLE2 AS
    SELECT 1 AS id, 20 AS drug2 FROM dual UNION ALL
    SELECT 3, 30 FROM dual UNION ALL
    SELECT 4, 40 FROM dual UNION ALL
    SELECT 5, 50 FROM dual
TABLE3 AS
    SELECT 1 AS id, 30 AS drug3 FROM dual UNION ALL
    SELECT 2, 30 FROM dual UNION ALL
    SELECT 3, 50 FROM dual UNION ALL
    SELECT 6, 60  FROM dual
-- END OF TEST DATA
SELECT nvl(nvl(t1.id, t2.id), t3.id) AS id, t1.drug1, t2.drug2, t3.drug3
FROM   table1 t1
FULL OUTER JOIN table2 t2 ON t2.id = t1.id
FULL OUTER JOIN table3 t3 ON t3.id = t1.id
ID                     DRUG1                  DRUG2                  DRUG3                 
1                      10                     20                     30                    
2                      20                                            30                    
3                      40                     30                     50                    
5                                             50                                           
4                      50                     40                                           
6                                                                    60                    
6 rows selected