combine 2 sql's from different tables into one query - sql

Question

I have for example as first query: (ararnr = article number)
Select ararnr,ararir,aoarom from ar left join ao ON AR.ARARNR=AO.AOARNR WHERE AR.ARARKD=1389
the second query uses the result from the first column from the first query to search in another table
Select votgan, sum(ststan) as totalStock from vo INNER JOIN st on vo.voarnr=st.starnr where voarnr = ararnr
How could I combine both ?
Please note : Not all articlenumbers from the first query will be found in the second, but I need them in my result.
In the result I need the columns from both queries.
EDIT
for example :
first query returns article numbers and the description:
+---------+--------------+
| ararnr | aoarom |
+---------+--------------+
| a123456 | description1 |
| b123456 | description2 |
| 0123456 | description3 |
+---------+--------------+
second query returns the totalstock for those articles:
+---------+--------------+
| ararnr | totalstock |
+---------+--------------+
| a123456 | 12 |
| b123456 | |
| 0123456 | 6 |
+---------+--------------+
Note the second one doesn't return a value since the articlenumber doesn't exist in this table.
In my result I would like to get the articlenumber with corresponding description and stock.
+---------+--------------+-----------+---------+
| ararnr | aoarom | totalStock| vovoan |
+---------+--------------+-----------+---------+
| a123456 | description1 | 12 | 2 |
| b123456 | description2 | | 1 |
| 0123456 | description3 | 6 | |
+---------+--------------+-----------+---------+
I'm using sql on db2
SECOND EDIT
The first query will select some article numbers (ararnr) from table ar and find the corresponding description (aoarom) in another table ao.
The second query finds the stock (vovoan and sum ststan) from two differend tables vo and st for the article numbers found in the first query.
The result should have the article number with corresponding description with corresponding stock from vo and st

Answer 1

I can't fully understand what you're asking, but another join may assist you.
example:
SELECT ar.ararnr, ar.ararir, ar.ararom, vo.votgan, SUM(vo.ststan) as totalStock
FROM ar LEFT JOIN ao ON [id=id] LEFT JOIN vo ON [id=id]
Because I can't tell what your tables structure are, or what you're really asking for, this is the best response I can give you.
This also may be what you're looking for:
Combining 2 SQL queries and getting result set in one

Answer 2

You can use this query.
SELECT ar.ararnr, ar.ararir, ar.ararom, vo.votgan, SUM(vo.ststan) as totalStock
FROM ar
LEFT JOIN ao ON ao.ararnr = ar.ararnr
LEFT JOIN vo ON vo.voarnr = ao.ararnr

Answer 3

If you are using SQL Server as database then this can be done with help of OUTER APPLY
SELECT ararnr,aoarom ,temp.totalStock
FROM ar
LEFT JOIN ao ON AR.ARARNR=AO.AOARNR
OUTER APPLY(
SELECT sum(ststan) as totalStock
FROM vo
INNER JOIN st on vo.voarnr=st.starnr
where voarnr = ar.ararnr
)temp
WHERE AR.ARARKD=1389

Answer 4

You'd get a much more complete answer if you were to post the table structure and desired result, but..
You can use the first query as a resultset for your second query, and join to it. something like:
Select
votgan,
sum(ststan) as totalStock
from vo
inner join (Select
ararnr,
ararir,
ararom
from ar
left join ao .....) z on vo.voarnr = z.ararnr
EDIT:
Select
votgan,
sum(ststan) as totalStock,
z.ararnr,
z.aoarom
from vo
inner join (Select
ararnr,
ararir,
ararom
from ar
left join ao .....) z on vo.voarnr = z.ararnr