join 2 sql queries and concatenate the results? - sql

Question

I have these 2 queries that almost give me the data I need:
SELECT Products.ItemID, Products.ItemID + '-' + ModifierListItems.ItemID AS SizeItemID
FROM ModifierLists INNER JOIN
ProductModifierLists ON ModifierLists.ModifierListID = ProductModifierLists.ModifierListID INNER JOIN
ModifierListItems ON ModifierLists.ModifierListID = ModifierListItems.ModifierListID INNER JOIN
Products ON ProductModifierLists.ItemID = Products.ItemID AND ProductModifierLists.ManufacturerID = Products.ManufacturerID
WHERE (Products.ManufacturerID = 262) AND ModifierListName='Size'
ORDER BY Products.ItemID
SELECT Products.ItemID, ModifierListItems.ItemID AS ColorItemID
FROM ModifierLists INNER JOIN
ProductModifierLists ON ModifierLists.ModifierListID = ProductModifierLists.ModifierListID INNER JOIN
ModifierListItems ON ModifierLists.ModifierListID = ModifierListItems.ModifierListID INNER JOIN
Products ON ProductModifierLists.ItemID = Products.ItemID AND ProductModifierLists.ManufacturerID = Products.ManufacturerID
WHERE (Products.ManufacturerID = 262) AND ModifierListName='Color'
ORDER BY Products.ItemID
The final output I am looking for is the SizeItemID concatenated with the ColorItemID joined on the ItemID.
Sample results of the 2 queries:
ItemID SizeItemID
------- ----------
A A-S
A A-M
B B-M
B B-L
ItemID ColorItemID
------- -----------
A BLK
A WHT
B BLK
B WHT
B GRN
The results I am looking for would be the following:
FinalItemID
-----------
A-S-BLK
A-S-WHT
A-M-BLK
A-M-WHT
B-M-BLK
B-M-WHT
B-M-GRN
B-L-BLK
B-L-WHT
B-L-GRN

Answer 1

You can take your two queries and join them together on ItemId to construct the final value.
In the following query, I also use aliases on your table names. Many people find meaningful aliases easier to read than long table names:
with tsize as (
SELECT p.ItemID,
p.ItemID + '-' + mli.ItemID AS SizeItemID
FROM ModifierLists ml INNER JOIN
ProductModifierLists pml
ON ml.ModifierListID = pml.ModifierListID INNER JOIN
ModifierListItems mli
ON ml.ModifierListID = mli.ModifierListID INNER JOIN
Products p
ON pml.ItemID = Products.ItemID AND
pml.ManufacturerID = p.ManufacturerID
WHERE (p.ManufacturerID = 262) AND ModifierListName='Size'
),
tcolor as (
SELECT p.ItemID, mli.ItemID AS ColorItemID
FROM ModifierLists moli INNER JOIN
ProductModifierLists pml
ON ml.ModifierListID = pml.ModifierListID INNER JOIN
ModifierListItems mli
ON ml.ModifierListID = mli.ModifierListID INNER JOIN
Products p
ON pml.ItemID = Products.ItemID AND
pml.ManufacturerID = p.ManufacturerID
WHERE (Products.ManufacturerID = 262) AND ModifierListName='Color'
)
select SizeItemID+'-'+ColorItemID
from tsize join tcolor
on tsize.itemid = tcolor.ItemID

Answer 2

Well, the cleanest looking way would be to put each query into it's own view. It also might help you understand what you're doing a little better. So if we took the queries and created views:
CREATE VIEW v_ProductSize
AS
SELECT Products.ItemID, Products.ItemID + '-' + ModifierListItems.ItemID AS SizeItemID
FROM ModifierLists INNER JOIN
ProductModifierLists ON ModifierLists.ModifierListID = ProductModifierLists.ModifierListID INNER JOIN
ModifierListItems ON ModifierLists.ModifierListID = ModifierListItems.ModifierListID INNER JOIN
Products ON ProductModifierLists.ItemID = Products.ItemID AND ProductModifierLists.ManufacturerID = Products.ManufacturerID
WHERE (Products.ManufacturerID = 262) AND ModifierListName='Size'
ORDER BY Products.ItemID
CREATE VIEW v_ProductColor
AS
SELECT Products.ItemID, ModifierListItems.ItemID AS ColorItemID
FROM ModifierLists INNER JOIN
ProductModifierLists ON ModifierLists.ModifierListID = ProductModifierLists.ModifierListID INNER JOIN
ModifierListItems ON ModifierLists.ModifierListID = ModifierListItems.ModifierListID INNER JOIN
Products ON ProductModifierLists.ItemID = Products.ItemID AND ProductModifierLists.ManufacturerID = Products.ManufacturerID
WHERE (Products.ManufacturerID = 262) AND ModifierListName='Color'
ORDER BY Products.ItemID
Then you have two simple views you can use normally, right? So your query would be:
SELECT ps.SizeItemID + '-' + pc.ColorItemID
FROM v_ProductSize ps
JOIN v_ProductColor pc ON ps.ItemID=pc.ItemID
See how that works? You're just doing a normal join like you would any other table. Now, say you don't want to create views, or for some reason don't have permission. You can just skip the view part itself, and use subqueries. You're just replacing the reference to the view, with the query itself in parentheses.
So it would look like this:
SELECT ps.SizeItemID + '-' + pc.ColorItemID
FROM (
SELECT Products.ItemID, Products.ItemID + '-' + ModifierListItems.ItemID AS SizeItemID
FROM ModifierLists INNER JOIN
ProductModifierLists ON ModifierLists.ModifierListID = ProductModifierLists.ModifierListID INNER JOIN
ModifierListItems ON ModifierLists.ModifierListID = ModifierListItems.ModifierListID INNER JOIN
Products ON ProductModifierLists.ItemID = Products.ItemID AND ProductModifierLists.ManufacturerID = Products.ManufacturerID
WHERE (Products.ManufacturerID = 262) AND ModifierListName='Size'
ORDER BY Products.ItemID
) ps
JOIN
( SELECT Products.ItemID, ModifierListItems.ItemID AS ColorItemID
FROM ModifierLists INNER JOIN
ProductModifierLists ON ModifierLists.ModifierListID = ProductModifierLists.ModifierListID INNER JOIN
ModifierListItems ON ModifierLists.ModifierListID = ModifierListItems.ModifierListID INNER JOIN
Products ON ProductModifierLists.ItemID = Products.ItemID AND ProductModifierLists.ManufacturerID = Products.ManufacturerID
WHERE (Products.ManufacturerID = 262) AND ModifierListName='Color'
ORDER BY Products.ItemID
) pc ON ps.itemID=pc.ItemID
Now... all that said, and with my coffee finally kicking in, you can greatly simplify the query into one with a one line modification:
SELECT Products.ItemID, Products.ItemID + '-' + colors.ItemID + '-' + sizes.ItemID AS SizeColorItemID
FROM ModifierLists
INNER JOIN ProductModifierLists ON ModifierLists.ModifierListID = ProductModifierLists.ModifierListID
INNER JOIN ModifierListItems sizes ON ModifierLists.ModifierListID = ModifierListItems.ModifierListID
--Put modifier list name in join clause
AND ModifierListName='Size'
INNER JOIN ModifierListItems colors ON ModifierLists.ModifierListID = ModifierListItems.ModifierListID
--same here, but for color
AND ModifierListName = 'Color'
INNER JOIN Products ON ProductModifierLists.ItemID = Products.ItemID
AND ProductModifierLists.ManufacturerID = Products.ManufacturerID
WHERE (Products.ManufacturerID = 262) --Remove modifierlistitem here so you can use it in the join clauses
ORDER BY Products.ItemID
So since we're really pulling the same information in both original queries, with just a single different condition... we can move the modifierlistitem.name into the join clause, then join to that same table again with a different condition. Then we alias the table based on which condition we used (size, color.) That way you can just refer to the alias and pull the correct item id, and concatenate them all at once.

Answer 3

Try this:
You just need make both the queries as derived tables and join on ItemID
Select a.SizeItemID+'-'+b.ColorItemID as FinalItemID
FROM
(SELECT Products.ItemID, Products.ItemID + '-' + ModifierListItems.ItemID AS SizeItemID
FROM ModifierLists INNER JOIN
ProductModifierLists ON ModifierLists.ModifierListID = ProductModifierLists.ModifierListID INNER JOIN
ModifierListItems ON ModifierLists.ModifierListID = ModifierListItems.ModifierListID INNER JOIN
Products ON ProductModifierLists.ItemID = Products.ItemID AND ProductModifierLists.ManufacturerID = Products.ManufacturerID
WHERE (Products.ManufacturerID = 262) AND ModifierListName='Size'
)a
JOIN
(SELECT Products.ItemID, ModifierListItems.ItemID AS ColorItemID
FROM ModifierLists INNER JOIN
ProductModifierLists ON ModifierLists.ModifierListID = ProductModifierLists.ModifierListID INNER JOIN
ModifierListItems ON ModifierLists.ModifierListID = ModifierListItems.ModifierListID INNER JOIN
Products ON ProductModifierLists.ItemID = Products.ItemID AND ProductModifierLists.ManufacturerID = Products.ManufacturerID
WHERE (Products.ManufacturerID = 262) AND ModifierListName='Color'
)b
on a.ItemID=b.ItemID
ORDER BY a.FinalItemID