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Is this equivalent to a LEFT JOIN?
SELECT DISTINCT a.name, b.name
FROM tableA a,
(SELECT DISTINCT name FROM tableB) as b
It seems as though there is no link between the two tables.
Is there an easier / more efficient way to write this?
Not, it is equivalent to a cross or cartesian join (really bad) with a distinct applied afterwards. It is pretty hard to know what you really want with the query as it stands.