php - Insert record if the id is not present in db -

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i want ask inserting record db if give id in url throught $getn , check if data of id n present in table must update else must insert data ?

how can in php plz me

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<?php  $n = $_get["n"];  $query = "select count(*) numberofrecords table id = '$n'"; mysql_query($query);  if ($numberofrecords == 0)     mysql_query("insert [...]"); else     mysql_query("update [...]");

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