mysql - Php PDO connection to database -

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i have database 2 table. students , profesors. create 1 more login table , there email , passwords students , profesors. want create student try login send him on student.php , when profesor try login send him on profesor.php

i try code, return me 1. not options.. 

if(isset($_post['submit'])){  $sql= "select count (*) `students` , 'profesors' `username` = :username , `password` = :password "; $result = $connection->prepare($sql); $result->bindparam(":username" ,$_post['username']); $result->bindparam(":password" ,$_post['password']); $result->execute();  $num=$result->rowcount(); if($num > 0){     header("location:index.php"); }else{     header("location:login.php"); }

i need idea, how change datebase or login code.

i not let professors , student use same login. answer question change query following:

select user_type `login_table`  `username` = :username , `password` = :password

once query return result check user_type field , redirect accordingly.

$num=$result->rowcount(); if($num > 0){    $data=$result->fetch();    if($data['professor']){       header("location: professor.php");    }else{       header("location: student.php");    } }else{     header("location:login.php"); }

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