mysql - limit left join - mysql

Question

left say for instance that I have the following query and want to limit the left join on a table, how do I achieve that?
SELECT * FROM Base
LEFT JOIN Derived1 ON Base.id = Derived1.id
LEFT JOIN Derived2 ON Base.id = Derived2.id
LEFT JOIN Derived3 ON (Base.id = Derived3.id WHERE Derived3.name LIKE 'test%' LIMIT 5) <-----
WHERE Base.id = 'someid';
I though I could write it like this:
SELECT * FROM Base
LEFT JOIN Derived1 ON Base.id = Derived1.id
LEFT JOIN Derived2 ON Base.id = Derived2.id
LEFT JOIN Derived3 ON Base.id = (
SELECT d3.id FROM Derived3 d3
WHERE d3.name LIKE 'test%' AND Base.id = Derived3.id
LIMIT 5
)
WHERE Base.id = 'someid';
but this gives me the incorrect result
I want all data which is inside Derived3 but only 5 items if Derived.name equals to test 1, test 2, test 3 etc.
There might be 100 000 000 tests inside that tables and a couple of thousand other stuff which doesn't start with 'test'.
So basically, give me anything inside Derived3 and max 5 rows that start with 'test'.
How do I solve this?

Answer 1

Check the bellow query.
SELECT *
FROM Base
LEFT JOIN Derived1 ON Base.id = Derived1.id
LEFT JOIN Derived2 ON Base.id = Derived2.id
LEFT JOIN Derived3 ON (
Base.id = Derived3.id
AND Derived3.id IN (
SELECT Derived3.id
FROM Derived3
WHERE Derived3.NAME LIKE 'test%' LIMIT 5
)
)
WHERE Base.id = 'someid'

Answer 2

I'm not sure if this can fit in your scenario but you can select from Derived3 using filter LIKE 'test%' and join the select result using alias.
I don't have MySql installed to try this but something like this should work:
SELECT * FROM Base
LEFT JOIN Derived1 ON Base.id = Derived1.id
LEFT JOIN Derived2 ON Base.id = Derived2.id
LEFT JOIN (
SELECT d3.id FROM Derived3 d3
WHERE d3.name LIKE 'test%'
LIMIT 5
) Derived3Alias ON Base.id = Derived3Alias.id
WHERE Base.id = 'someid'
GROUP BY Base.id;
Maybe you will need to write "as Derived3Alias" but try first without 'as' I think it should work.