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SQL join 3 tables & show all rows from one
Posted on 2013-02-07
Using mysql 5.5 but don't think that matters...
I have 3 tables
accounts
|a_id|StoreName|Address etc
products_accounts
|pa_id|p_fk|a_fk|
products
|p_id|UPC|ProdName| etc
some accounts have multiple products associated with them, some don't have any.
I need a query to return all accounts with associated products
result
----------------
a_id|StoreName | UPC | ProdName
1234 | Bob's Mart |12345 | WidgetA |
1235 | Bob's Mart |22345 | WidgetB |
1256 | Smart Mart |12345 | WidgetA |
3321 | Kwik Mart | null | null
I've tried a few combinations of left & right joins but can't seem to get it right.
I'm doing this in coldfusion so I can nest the product query within a store loop but Is this do-able with joins (or unions)??
I have 3 tables
accounts
|a_id|StoreName|Address etc
products_accounts
|pa_id|p_fk|a_fk|
products
|p_id|UPC|ProdName| etc
some accounts have multiple products associated with them, some don't have any.
I need a query to return all accounts with associated products
result
----------------
a_id|StoreName | UPC | ProdName
1234 | Bob's Mart |12345 | WidgetA |
1235 | Bob's Mart |22345 | WidgetB |
1256 | Smart Mart |12345 | WidgetA |
3321 | Kwik Mart | null | null
I've tried a few combinations of left & right joins but can't seem to get it right.
I'm doing this in coldfusion so I can nest the product query within a store loop but Is this do-able with joins (or unions)??
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8 Comments
SELECT t1.a_id, t1.storename, t3.upc, t3.prodname
FROM accounts t1
INNER JOIN products_accounts t2
ON t1.a_id = t2.a_fk
LEFT JOIN products t3
ON t2.p_fk = t3.p_id
unless I am missing something about your tables that should return what you want.
FROM accounts t1
INNER JOIN products_accounts t2
ON t1.a_id = t2.a_fk
LEFT JOIN products t3
ON t2.p_fk = t3.p_id
unless I am missing something about your tables that should return what you want.
select allaccounts
from accounts left join products
ON t1.id = t2.id -- this will return all accounts , if you need
--you can more tables using the left join all the way.
union
select allaccounts
from accounts join products ON t1.id = t2.id -- this will return accounts with products
from accounts left join products
ON t1.id = t2.id -- this will return all accounts , if you need
--you can more tables using the left join all the way.
union
select allaccounts
from accounts join products ON t1.id = t2.id -- this will return accounts with products
Rusty, I basically had what you've posted, and I now realize (I think) the reason it isn't working is that only accounts that have products associated with them are even -in- products_accounts table so the join can't work (as I was hoping)
I get products by accounts but if the account has no products associated with it, (ie: not in products_accounts table) then they don't show.
I think the only way to do this is in 2 parts. Unless someone has any other ideas.
I get products by accounts but if the account has no products associated with it, (ie: not in products_accounts table) then they don't show.
I think the only way to do this is in 2 parts. Unless someone has any other ideas.
ok, I see what you mean, try this:
SELECT t1.a_id, t1.storename, t3.upc, t3.prodname
FROM accounts t1
INNER JOIN products_accounts t2
ON t1.a_id = t2.a_fk
LEFT JOIN products t3
ON t2.p_fk = t3.p_id
UNION
SELECT a_id, storename, NULL, NULL
FROM accounts t1
WHERE a_id NOT IN (SELECT a_fk FROM products_accounts)
ORDER BY a_id
SELECT t1.a_id, t1.storename, t3.upc, t3.prodname
FROM accounts t1
INNER JOIN products_accounts t2
ON t1.a_id = t2.a_fk
LEFT JOIN products t3
ON t2.p_fk = t3.p_id
UNION
SELECT a_id, storename, NULL, NULL
FROM accounts t1
WHERE a_id NOT IN (SELECT a_fk FROM products_accounts)
ORDER BY a_id
OK that's doing the trick...brutally slow however (28secs to return 15k rows). I guess that's the problem with Union?
If I was just returning 1 row it would be ok but I'm doing proximity lookups based on lat/lon and can have up to 50 store locations in an area.
Going to have to try something else I think. Unless you have any other suggestions, I'll award pts & close the q..
If I was just returning 1 row it would be ok but I'm doing proximity lookups based on lat/lon and can have up to 50 store locations in an area.
Going to have to try something else I think. Unless you have any other suggestions, I'll award pts & close the q..
try this
Select a_id, StoreName , UPC , ProdName
from accounts Left outer join products_accounts
on a_id = a_fk
Left outer join products on p_id = p_fk
Select a_id, StoreName , UPC , ProdName
from accounts Left outer join products_accounts
on a_id = a_fk
Left outer join products on p_id = p_fk
Active today
with table references included :-)
SELECT accounts.a_id, accounts.StoreName , products.UPC , products.ProdName
FROM accounts
LEFT OUTER JOIN products_accounts ON accounts.a_id = products_accounts.a_fk
LEFT OUTER JOIN products ON products_accounts.p_fk = products.p_id
SELECT accounts.a_id, accounts.StoreName , products.UPC , products.ProdName
FROM accounts
LEFT OUTER JOIN (
SELECT DISTINCT
products_accounts.a_fk, products_accounts.p_fk
FROM products_accounts
) ap ON accounts.a_id = ap.a_fk
LEFT OUTER JOIN products ON ap.p_fk = products.p_id
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