Mysql subquery per row - mysql

Question

I'm trying to show a matrix table with the results from a vendor in a category. Like:
+-----------+-------------+-------------+------+
| | Category 1 | Category 2 | ... |
+-----------+-------------+-------------+------+
| Vendor 1 | 8900 | 0 | ... |
| Vendor 2 | 56890 | 4000 | ... |
| ... | ... | ... | ... |
+-----------+-------------+-------------+------+
I already made a query for just one vendor:
SELECT ut.unit_name, IFNULL(SUM(commission_fix_out),0)
FROM transaction t
JOIN office_per_transaction opt
ON t.id = opt.transaction_id
JOIN_vendor_per_transaction ppt
ON t.id = ppt.transaction_id
AND ppt.vendor_id = 2
RIGHT JOIN unit_type ut
ON t.unit_type_id = ut.id
AND transaction_end_week BETWEEN 0 AND 14
AND YEAR(transaction_end_date) = 2012
GROUP BY ut.id
Which gives me following result:
+-------------+---------+
| Category | Result |
+-------------+---------+
| Category 1 | 56890 |
| Category 2 | 4000 |
| ... | ... |
+-------------+---------+
Now i would like to see a concatenation of this query per vendor in a given office.
First, I tried replacing AND ppt.vendor_id = 2 with AND ppt.vendor_id IN (SELECT id FROM vendor WHERE office_id = 1) but that gave me the total result of all the vendors in that office.
Secondly, I tried using a subquery. But that gave me an error stating unknown column.
What i want to achieve is a resultset like:
+-----------+--------- -------+
| Vendor | Results |
+-----------+-----------------+
| Vendor 1 | 8900,0,... |
| Vendor 2 | 56890,4000,... |
| ... | ...,...,... |
+-----------+-----------------+
Am i trying something unrealistic and should i rather perform above query per vendor. Or am i missing something here?
#SashiKant I've tried many queries last days, but it was something like this:
SELECT v.id, GROUP_CONCAT(r.result) FROM vendor v,
( SELECT ut.unit_name, IFNULL(SUM(commission_fix_out),0) as result
FROM transaction t JOIN office_per_transaction opt ON t.id = opt.transaction_id
JOIN vendor_per_transaction ppt ON t.id = ppt.transaction_id
AND ppt.vendor_id = p.id
RIGHT JOIN unit_type ut ON unit_type_id = ut.id
AND transaction_end_week BETWEEN 0 AND 14
AND YEAR(transaction_end_date) = 2012 GROUP BY ut.id) as r

Answer 1

You can use group_concat.
Pseudo SQL:
select vendor, group_concat(result)
from mytable
group by vendor
You might "simplify" it by creating a view. Since I don't know your table structure, this is just guessing
create view commissions as
SELECT ppt.vendor_id as vendor, ut.unit_name as category,
IFNULL(SUM(commission_fix_out),0) as commission
FROM transaction t
JOIN office_per_transaction opt
ON t.id = opt.transaction_id
JOIN_vendor_per_transaction ppt
ON t.id = ppt.transaction_id
RIGHT JOIN unit_type ut
ON t.unit_type_id = ut.id
AND transaction_end_week BETWEEN 0 AND 14
AND YEAR(transaction_end_date) = 2012
GROUP BY ppt.vendor_id, ut.id;
and then select
select vendor, group_concat(commission)
from commissions
group by vendor;

Answer 2

You probably need to join against the vendors table to get the vendors you want (rather than a single vendor). Also you need more clauses in the GROUP BY (and you really should use all the non aggregate columns from the SELECT in the GROUP BY clause - mysql doesn't object but most flavours of SQL do object if you miss some out).
Something like this (not tested so please excuse any typos)
SELECT vendor_id, ut.id, ut.unit_name, IFNULL(SUM(commission_fix_out),0)
FROM transaction t
INNER JOIN office_per_transaction opt
ON t.id = opt.transaction_id
INNER JOIN_vendor_per_transaction ppt
ON t.id = ppt.transaction_id
INNER JOIN vendor ve
ON ve.id = ppt.vendor_id
RIGHT JOIN unit_type ut
ON t.unit_type_id = ut.id
AND transaction_end_week BETWEEN 0 AND 14
AND YEAR(transaction_end_date) = 2012
WHERE ve.office_id = 1
GROUP BY vendor_id, ut.id, ut.unit_name
ORDER BY vendor_id, ut.id, ut.unit_name
If you want a row per vendor with a single column for all the amounts for that vendor then something like this.
SELECT vendor_id, GROUP_CONCAT(CommisionAmount)
FROM (
SELECT vendor_id, ut.id, ut.unit_name, IFNULL(SUM(commission_fix_out),0) AS CommisionAmount
FROM transaction t
INNER JOIN office_per_transaction opt
ON t.id = opt.transaction_id
INNER JOIN_vendor_per_transaction ppt
ON t.id = ppt.transaction_id
INNER JOIN vendor ve
ON ve.id = ppt.vendor_id
RIGHT JOIN unit_type ut
ON t.unit_type_id = ut.id
AND transaction_end_week BETWEEN 0 AND 14
AND YEAR(transaction_end_date) = 2012
WHERE ve.office_id = 1
GROUP BY vendor_id, ut.id, ut.unit_name
ORDER BY vendor_id, ut.id, ut.unit_name) Sub1