Select multiple tables when one table is empty in MySQL

Question

I\'m trying to do

SELECT * FROM a, b

However, it doesn\'t return anything if one of the tables is empty. How do I make it so it returns \'a

Answer 1

You should do a left join.

Like this

SELECT *
FROM A
 LEFT JOIN B ON A.ID = B.ID

Then you receive the rows in A and the respective row in B if exists.