Selvom manualen synes at foreslå, at INNER JOIN-syntaksen skulle fungere i en DELETE, jeg ved, at dette alternativ med join-klausulen er flyttet til where-betingelsen ville fungere...
DELETE a.* FROM t1 AS a, t1 as b
WHERE
a.some_field_b=b.some_field_b AND
a.some_field_a = value_x AND
b.some_field_a = value_y
Edit:Jeg har lige prøvet dette, hvilket virkede for mig:
DELETE a FROM t1 AS a
INNER JOIN t1 as b USING(some_field_b)
WHERE
a.some_field_a = value_x AND
b.some_field_a = value_y