MYSQL return OK

[Rodrigo dos Santos Sousa]

Good night friends,

Can someone tell me why a query below returns OK?

SELECT count (*) as Business_Days
FROM owner.dias_uteis d
WHERE d.data_util
ENTER (select ts.created by owner.table table where ts.called in ('1455678', '1459783') group by ts.called) And now ()

I need to count how many days a call was opened,
if I pass just one condition, the counter works. However, when I search for more than one called mysql returns only OK and nothing to see.