Delete Button for active record

Hello I need a button with a formula that DELETE the active record (and his links)

In my DB, I have many contacts in double, triple, from different imports ... and I can't avoid a manual (my brain) traitement to decide wich one is better to keep and what datas I repatriate.

Structure : CONTACTS (many) -> LINKSC (1) <-SITES (many)

Unfortunately, I can't delete useless CONTACTS records from the global search results (up right)

So I thought a button in my CONTACTS table could do the job ? And that could in the same time suppress the useless LINKSC records too ?

What would be the good formula ? 

Thanks !

Pierre