Select first record in a One-to-Many relation using left join

Question

I\'m trying to join two tables using a left-join. And the result set has to include only the first record from the \"right\" joined table.

Lets say I have two tables

Answer 1

I modified the answer from ruakh and this seem to work perfectly with mysql.

SELECT 
   table_a.code,
   table_a.emp_no,
   table_b.city,
   table_b.county
FROM table_a a
LEFT JOIN table_b b
ON b.code = a.code 
AND b.id = (  SELECT id FROM table_b 
              WHERE table_b.code = table_a.code 
              LIMIT 1
           )
;