Suggestion of a simple SQL query - sql

Question

I have the following table:
state product_a product_b final_score
FL Apple Açai Berries 9
FL Apricot Banana 15
FL Avocado Coconut 5
FL Bilberry Apricot 17
FL Blackcurrant Apricot 6
FL Blackcurrant Boysenberry 12
FL Blueberry Avocado 11
FL Blueberry Cantaloupe 6
FL Cantaloupe Coconut 1
FL Currant Blackcurrant 5
FL Cherry Currant 10
FL Cherimoya Cherry 6
FL Cherimoya Date 14
FL Cloudberry Blueberry 16
FL Coconut Apricot 14
FL Cranberry Damson 1
FL Date Banana 5
NY Apricot Blackcurrant 5
NY Apricot Dragonfruit 15
NY Avocado Cherimoya 16
NY Avocado Coconut 18
NY Banana Damson 14
NY Bilberry Apricot 16
NY Bilberry Avocado 1
NY Blackberry Blackcurrant 20
NY Blackberry Cherimoya 12
NY Blackcurrant Damson 19
Based on "state" and "product_A" I need to return "product_B" with the highest "final_score".
For instance, if I check for NY "state", "product_A" Blackberry, I want my query to return Blackcurrant.
For instance, I used the following query:
select product_b from PRODUCTSUGGESTION a,
(select max(final_score) maxscore from PRODUCTSUGGESTION
where product_A like '%Blackcurrant%' and state like 'FL') r
where r.maxscore=final_score and product_A like '%Blackcurrant%' and state like 'FL'
The output would be: Boysenberry
The query I presented above gives me the wanted output. However, I know that joins increase the query complexity. Could anyone suggest another way of doing it with a simpler query?

Answer 1

Seems like this is too simple to me, but here you go:
SELECT product_b FROM PRODUCTSUGGESTION
WHERE state = 'FL' AND product_a = 'Blackcurrant'
ORDER by final_score DESC FETCH FIRST 1 ROW ONLY

Answer 2

You need calculate the maxScore first. Then join both tables to get the name.
SQL Fiddle Demo
This use sql server cte, MySql need inner select instead.
WITH maxScore as (
SELECT state, product_a, max(final_score) as final_score
FROM Table1
GROUP BY state, product_a
)
SELECT t.*, m.final_score
FROM Table1 t
inner join maxScore m
on t.state = m.state
and t.product_a = m.product_a
and t.final_score = m.final_score