SQL selecting most recent row inside join - mysql

Question

I have 2 tables companies and invoices
I want to select all companies with their most recent invoice price.
I don't seem to get it working.
This is what I tried:
SELECT *
FROM companies H INNER JOIN
invoices V
ON H.company_id = V.BC_ID
WHERE V.ISCOMMISSIE = 0 AND
V.DATE = (SELECT MAX(v2.DATE) FROM invoices v2 WHERE v2.BC_ID = V.BC_ID AND v2.ISCOMMISSIE = 0);
But the query loads very long and I don't know why.
The structure looks like this:
companies
company_id | company_name |
1 | company 1 |
2 | company 2 |
invoices
invoice_id | BC_ID | DATE | ISCOMMISSIE | price |
1 | 2 | 2020-01-01 | 0 | 340,40 |
2 | 1 | 2020-01-11 | 0 | 240,40 |
3 | 1 | 2020-01-08 | 0 | 250,30 |
4 | 2 | 2020-01-18 | 0 | 150,30 |
5 | 2 | 2020-01-19 | 1 | 150,30 |
The BC_ID is the same as the company_id and ISCOMMISSIE should be 0.
I want to select the most recent date.
Does someone have an idea on how to do this and also make the query as fast as possible?
http://sqlfiddle.com/#!9/2fc3a/1

Answer 1

Try:
SELECT H.*, V.*
FROM companies H
INNER JOIN invoices V ON H.company_id = V.BC_ID
INNER JOIN ( SELECT v2.BC_ID, MAX(v2.DATE) DATE
FROM invoices v2
WHERE v2.ISCOMMISSIE = 0
GROUP BY v2.BC_ID ) v3 ON v.BC_ID = v3.BC_ID
AND v.DATE = v3.DATE
AND V.ISCOMMISSIE = 0
And the index invoices (ISCOMMISSIE, BC_ID, DATE) may help...

Answer 2

Your query is fine:
SELECT *
FROM companies H INNER JOIN
invoices V
ON H.company_id = V.BC_ID
WHERE V.ISCOMMISSIE = 0 AND
V.DATE = (SELECT MAX(v2.DATE)
FROM invoices v2
WHERE v2.BC_ID = V.BC_ID AND
v2.ISCOMMISSIE = 0
);
For performance, you want an index on invoices(BC_ID, ISCOMMISSIE, DATE).
A good alternative is to use window functions:
SELECT *
FROM companies H INNER JOIN
(SELECT V.*,
ROW_NUMBER() OVER (PARTITION BY BC_ID ORDER BY DATE DESC) as seqnum
FROM invoices V
WHERE V.ISCOMMISSIE = 0
) V
ON H.company_id = V.BC_ID
WHERE seqnum = 1;

Answer 3

Depending on columns you need, you might not need to join with companies table. Also it is not needed to test for iscommissie = 0 two times, you can just test it one time in the subquery before joining.
See the query below :
SELECT i.*
FROM invoices i
JOIN (
SELECT i.bc_id, MAX(date) AS max_date
FROM invoices i
WHERE iscommissie = 0
GROUP BY i.bc_id
) i_temp ON i.bc_id = i_temp.bc_id AND i.date = i_temp.max_date
FIND A DEMO HERE

Answer 4

Another way to get the expected output:
select * from companies A join (
select * from invoices where (BC_ID,DATE) in(
select BC_ID as BC_ID, MAX(DATE) DATE from invoices where ISCOMMISSIE = 0 group by
BC_ID
))B on A.company_id=B.BC_ID;