mysql union and group by similar fields - mysql

Question

Here is my query (I replaced table names with generic ones). I am trying to do a union all on two different queries in order to group them all by date so that results with similar dates come out as one row.
I am getting the "Every derived table must have its own alias" error when attempting to execute. What am I typing in wrong?
I have researched this but couldn't find the answer. Every selected field has an alias? Or is the issue in the first SELECT?
SELECT SUM(val), id, dat, title FROM (
SELECT table1.product_id as id, SUM(table1.qty) as val, DATE_FORMAT(table1.created, '%Y-%m-1') as dat, table2.title as title
FROM table1
LEFT JOIN table3 ON table1.event_id = table3.id
LEFT JOIN table2 ON table1.product_id = table2.id
WHERE table1.user_id = $user_id AND table3.active != 2 AND table3.temp = 0 AND table2.active != 2
GROUP BY dat
UNION ALL
SELECT table4.product_id as id, SUM(table4.qty) as val, DATE_FORMAT(table4.created, '%Y-%m-1') as dat, table2.title as title
FROM table4
LEFT JOIN table5 ON table4.festival_id = table5.id
LEFT JOIN table2 ON table4.product_id = table2.id
WHERE table4.user_id = $user_id AND table5.active != 2 AND table2.active != 2
GROUP BY dat
)
GROUP BY id
ORDER BY dat ASC
Here is what I am attempting to do:
My original result:
Array
(
[0] => stdClass Object
(
[id] => 1
[val] => 1
[dat] => 2012-05-1
[title] => Test Product
)
[1] => stdClass Object
(
[id] => 1
[val] => 8
[dat] => 2012-06-1
[title] => Test Product
)
[2] => stdClass Object
(
[id] => 2
[val] => 4
[dat] => 2012-06-1
[title] => Test Product 2
)
[3] => stdClass Object
(
[id] => 3
[val] => 6
[dat] => 2012-06-1
[title] => Test Product 3
)
[4] => stdClass Object
(
[id] => 1
[val] => 10
[dat] => 2012-05-1
[title] => Test Product
)
[5] => stdClass Object
(
[id] => 1
[val] => 8
[dat] => 2012-06-1
[title] => Test Product
)
[6] => stdClass Object
(
[id] => 2
[val] => 3
[dat] => 2012-06-1
[title] => Test Product 2
)
[7] => stdClass Object
(
[id] => 3
[val] => 3
[dat] => 2012-06-1
[title] => Test Product 3
)
)
So if they have a similar date and ID, I need those to be just one result. Like so:
Array
(
[0] => stdClass Object
(
[id] => 1
[val] => 11
[dat] => 2012-05-1
[title] => Test Product
)
[1] => stdClass Object
(
[id] => 1
[val] => 8
[dat] => 2012-06-1
[title] => Test Product
)
[2] => stdClass Object
(
[id] => 2
[val] => 7
[dat] => 2012-06-1
[title] => Test Product 2
)
[3] => stdClass Object
(
[id] => 3
[val] => 9
[dat] => 2012-06-1
[title] => Test Product 3
)
)
Please let me know if you need anything else. Thanks in advance.

Answer 1

Try this:
SELECT SUM(val), id, dat, title FROM (
SELECT table1.product_id as id, SUM(table1.qty) as val, DATE_FORMAT(table1.created, '%Y-%m-1') as dat, table2.title as title
FROM table1
LEFT JOIN table3 ON table1.event_id = table3.id
LEFT JOIN table2 ON table1.product_id = table2.id
WHERE table1.user_id = $user_id AND table3.active != 2 AND table3.temp = 0 AND table2.active != 2
GROUP BY dat
UNION ALL
SELECT table4.product_id as id, SUM(table4.qty) as val, DATE_FORMAT(table4.created, '%Y-%m-1') as dat, table2.title as title
FROM table4
LEFT JOIN table5 ON table4.festival_id = table5.id
LEFT JOIN table2 ON table4.product_id = table2.id
WHERE table4.user_id = $user_id AND table5.active != 2 AND table2.active != 2
GROUP BY dat
) AS t
GROUP BY id, dat
ORDER BY dat ASC
As the error suggests, every view/derived table must have an alias..
Edit: This will give you records with distinct id/dat pair. Seems this is what is you are after.