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june_c21

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hi , i want  to select qty from master where id=$id , then i want to minus the qty = qty -1  and update in the query .

here is my code . can tell me what went wrong ?

 

$query= "SELECT qty FROM master where id=$id";
$result = mysql_query($query,$dblink);
  while($myrow = mysql_fetch_row($result))
  {
qty -= 1;

  $query = "UPDATE master SET qty='$qty' WHERE id= $id";
$result = mysql_query($query,$dblink);

  }

 

thanks

 

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