Select records in on table based on conditions from another table?

Question

I have got 2 tables, A, B

A: id is primary key and indexed

id,  type_id,  status
------------------
1,  1,  True
2,  1,  False
3,  2,  False
...

B: (Type)          


        

Answer 1

SELECT B.*
FROM B
WHERE B.type_id
IN 
( SELECT A.type_id 
  FROM A WHERE status='True'
);