从与另一个表具有n：n关系的表中进行选择，并在第二个表中选中一个参数

Question

I got something like the following Table structure

table a
Int id primary key
String description

table b
Int id primary key
some fields...

table ab (as a linking table because the table a and b have a n:n relation)
Int id primary key
int bid foreign key to b.id
int aid foreign key to a.id

How can I select every b that's linked with an a that's description is 'Test' ?

Right now I'm working with this method (really slow)

first i select the id of a with

select id from a
where description = 'Test';

then i take all id's from b that are linked in the table ab into an list

select bid from ab
where aid = id;

and last i select them one by one inside a for loop with this query

select * from b
where id = id;

so how can I improve this?
thx for your help

Answer 1

Please tag your question with the sql provider you are using.

Anyways, something like this:

select b.*
from a join ab on a.id = ab.aid join b on ab.bid = b.id
where a.description = 'TEST';