error in mysql query - inner join inside where - mysql

Question

i got this error:
for the right syntax to use near 'INNER JOIN oferta B ON A.oferta_id_oferta = B.id_oferta AND B.oferta = "design' at line 4
i can't make a inner join inside a where clause ? or exists other problem with this query ?
UPDATE `oferta_has_tags` A
SET fraccao = "1/7"
WHERE (
INNER JOIN oferta B
ON A.oferta_id_oferta = B.id_oferta
AND B.oferta = "designer"
AND B.estado = 0)

Answer 1

Express it as a simple IN:
UPDATE oferta_has_tags
SET fraccao = '1/7'
WHERE oferta_id_oferta IN (
SELECT id_oferta
FROM oferta
WHERE oferta = 'designer'
AND estado = 0)
Also, changed double quotes (") to single quotes (') - using double quotes will cause an error

Answer 2

The query is wrong. It must have SELECT and FROM clauses:
It must be something like this:
UPDATE oferta_has_tags A
SET fraccao = "1/7"
WHERE id = ( SELECT id FROM yourtable WHERE something = somevalue )
Make sure that the subquery should return exactly 1 value. If you want to update multiple records using above query, replace "=" with "IN". Like this:
UPDATE oferta_has_tags A
SET fraccao = "1/7"
WHERE id IN ( SELECT id FROM yourtable WHERE something = somevalue )
Hope it helps...