How Design Handle Notification with diffrent notification

Yes, I would create a seperate table for this. Lets call it "cu_announcement_read" and just add two columns in there: "cu_anoun_id" and "cu_id_user". Then just fill it as some user reads some announcement.

Hey sorry slow respond cause yesterday was weekend and sunday so i didn't online ?
my question is how can i query to count is user read or not read ? i didn't get idea about this,