Question

I’m stuck on a SQL issue, I’m almost sure it’s all easy but I can’t find a proper answer. Below here is the example. I want to combine those 2 queries :

SELECT 
    num_rata, SUM(val_imp*0.01) AS amount 
FROM table1
WHERE 
    col1 <> 0
    AND num_contract = 88
GROUP BY num_rata

That returns something like :

1   215.00
2   220.00
3   210.00
4   115.00
5   315.00

And :

SELECT 
    num_rata, SUM(val_ban*0.01) AS amount
FROM table2
WHERE 
    num_contract = 2988
GROUP BY num_rata;

Example result set :

1   15.00
2   615.00
3   275.00
4   285.00
5   285.00
6   275.00
7   260.00
8   215.00
9   215.00

As a final result I would like something like this :

1   215.00 15.00
2   220.00 615.00
3   210.00 275.00
4   115.00 285.00
5   315.00 285.00
6          275.00
7          260.00
8          215.00 
9          215.00

Thank you for any hint.

fabien.

Answer 1

You could use either a union or an outer join – I would prefer a union, like this:

SELECT num_rata, sum(val_imp)*0.01 imp_amount, sum(val_ban)*0.01 ban_amount
from (SELECT num_rata, val_imp, 0 val_ban
      FROM table1
      WHERE col1 <> 0 AND num_contract = 88
      UNION ALL
      SELECT num_rata, 0 val_imp, val_ban
      FROM table2
      WHERE num_contract = 2988) v
GROUP BY num_rata;