Using the OR operator in a nested SQL Statement - sql

Question

I have a database with vendors, what they sell and where they are located.
I need to search for vendors that are based off of a specific locality like a state or for vendors who sell a certain number of products.
An example of this question is:
What are the full names of all vendors who can supply more than one item or are based in Illinois?
This would be easy if I could use two sql queries (but for this problem I cannot).
Assuming there is no joins between tables used, my solution is incorrect but this is what I tried
select
cs.vendor_id, name, count(cs.PRODUCT_ID)
from
grocery.vendor
where
va.state_territory_province = 'Illinois'
group by
(cs.vendor_id)
or /# error found here #/
having
(count(cs.product_id)>1);
ERROR at line 1:
ORA-00933: SQL command not properly ended
If I try each one separately, I get these results
Using Illonois
select
cs.vendor_id, v.name, count(cs.PRODUCT_ID)
from
grocery.vendor v
inner join grocery.vendor_address va
on (v.vendor_id = va.vendor_id)
inner join grocery.can_supply cs
on (v.vendor_id = cs.vendor_id)
where
va.state_territory_province = 'Illinois'
group by
(cs.vendor_id, v.name);
VENDOR_ID NAME COUNT(CS.PRODUCT_ID)
33 Drinks R Us 1
35 Jungle Man 1
34 Poland Spring 1
Using the number of products
select
cs.vendor_id, v.name, count(cs.PRODUCT_ID)
from grocery.vendor v
inner join grocery.vendor_address va
on (v.vendor_id = va.vendor_id)
inner join grocery.can_supply cs
on (v.vendor_id = cs.vendor_id)
group by (cs.vendor_id, v.name)
having(
count(cs.product_ID)>1);
VENDOR_ID NAME COUNT(CS.PRODUCT_ID)
8 Orgo Home Farm 3
17 Wellness 2
21 Wily Wonka 4
27 Camel 3
29 Supplies R Us 5
13 Clean Me Please 5
15 Oral Care Inc 2
31 Cheese Cake Factory 2
37 Crunchy 2
1 Moo Moo Milk Farm 4
4 Haagen Daz 3
26 Beer Inc 4
6 Sailor Bob 3
10 Dawn 2
16 SPAM 2
18 Wonder inc 3
5 Butcher Mat 3
9 Soda Forever 4
14 Wash Shampoo Inc 4
24 Huntz 4
20 Hershey 3
22 Bake Me Inc 5
30 We Make Pizza 2
36 Taste Treat 3
7 Monkey Paradise 6
19 Puff 5
26 rows selected.
Basically I want to merge these two queries into one. Is there a way to nest these together?

Answer 1

I would be inclined to do:
select v.*
from gorcery.vendor v join
grocery.vendor_address va
on v.vendor_id = va.vendor_id
where va.state_territory_province = 'Illinois' or
(select count(*)
from grocery.can_supply cs
where v.vendor_id = cs.vendor_id
) > 1;
Note: this isn't perfect, because a vendor can have multiple addresses. So, I think the better solution is:
select v.*
from gorcery.vendor v
where exists (select 1
from grocery.vendor_address va
where v.vendor_id = va.vendor_id and
va.state_territory_province = 'Illinois'
) and
(select count(*)
from grocery.can_supply cs
where v.vendor_id = cs.vendor_id
) > 1;

Answer 2

You should be able to put both conditions in the HAVING clause:
select v.vendor_id,
v.name,
count(cs.PRODUCT_ID)
from grocery.vendor v
join grocery.vendor_address va
on v.vendor_id = va.vendor_id
join grocery.can_supply cs
on v.vendor_id = cs.vendor_id
group by v.vendor_id, v.name, va.state_territory_province
having va.state_territory_province = 'Illinois'
or count(cs.product_ID) > 1
As pointed out in the comments, I couldn't just use va.state_territory_province in the HAVING clause (silly me), so I added it to the GROUP BY clause. I am assuming that every vendor only has one address.

Answer 3

how about using UNION clause for the two queries?