[Paul M]

Originally Posted by Dr.CustUmz

without the limit 1 it erases every entry of that that thread id

Is that not what you are trying to do ?
I guess I dont understand your actual objective then.

Originally Posted by Dr.CustUmz

the problem with the method im using

$vbulletin->db->query_write("
  DELETE FROM " . TABLE_PREFIX . "threadviews
  WHERE threadid = $threadinfo[threadid]
  LIMIT 1
");

is if there is no row with that threadID in the threadviews table it adds the original view to the table.

A delete query cannot add anything, ever.

You are using shutdown queries, which quite possibly get run backwards to how you define them (there isnt any guarantee what order they will run). So more likely the delete is running first, then the insert. You wont notice this if there is at least one existing record, but you will if there are none.