Simulate a left join without using "left join"

Just reverse the tables and use a right join instead.

SELECT A.id,
       B.id
FROM   B
       RIGHT JOIN A
         ON A.name = B.name  

you can use this approach, but you must be sure that the inner select only returns one row.

SELECT A.id, 
(select B.id from B where  A.name = B.name) as B_ID
FROM A