Combining two join queries into one - sql

Question

I have two queries that I want to combine into one.
First query is
select
a.desc as desc
,sum(bdd.amount) as amount
from
t_main c
left outer join
t_direct bds on (bds.mainId = c.id)
left outer join
tm_defination a on (a.id = bds.defId)
where
c.descId = 1000000134
group by
a.desc;
It returns following result
desc amount
NW 12.00
SW 10
Second query I have
select
a.desc as desc
,sum(bdd.newAmt) as amount1
from
t_main c
left outer join
t_newBox b on (b.mainId = c.id)
left outer join
t_transition c on (c.id = b.tranId)
left outer join
tm_defination def a on (a.id = c.defId)
where
c.descId = 1000000134
group by
a.desc;
This query returns this result:
desc amount
NW 4.00
I want to combine these two queries so that I get out put like this..
desc amount amount1
NW l2.00 4.00
SW 10.00
I tried UNION between query 1 and query 2 but the result came out as
desc amountamount1
NW 16.00
SW 10.00
Which is not what I wanted.
Please let me know how I can create a query or expression to achieve this.
Thanks

Answer 1

Instead of union you can use the join.
In this case your code will be like the following:
select coalesce(q1.desc, q2.desc) as desc,
q1.amount as amount, q2.amount1 as amount1
from
(
select
a.desc as desc
,sum(bdd.amount) as amount
from t_main c
left outer join t_direct bds on (bds.mainId=c.id)
left outer join tm_defination a on (a.id =bds.defId)
where c.descId=1000000134
group by a.desc
) q1
full join
(
select
a.desc as desc
,sum(bdd.newAmt) as amount1
from t_main c
left outer join t_newBox b on (b.mainId=c.id)
left outer join t_transition c (c.id=b.tranId)
left outer join tm_defination def a on (a.id =c.defId)
where c.descId=1000000134
group by a.desc
) q2
on q1.desc = q2.desc
order by 1
Because of the same table usage for the desc column source, coalesce function can be used. The result query will be ordered by the result desc column.