retrieve single row data in mysql using php - php

Question

I created a website that has multiple logins and unique informations to it.. i want to retrieve the data from one user. example my username is qwert and my password is 1234, I want to retrieve his unique information to the database. I used the sample code in w3schools and it selects all the data but all I want to do is to retrieve the data from the user which is only logged in.
can anyone help me about this? any help will be much appreciated.
mysql_select_db("xone_login", $con);
$result = mysql_query("SELECT * FROM admin WHERE username = '$myusername' ");
echo "<table border='1'>
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>";
while($row = mysql_fetch_array($result))
{
echo "<tr>";
echo "<td>" . $row['overtime'] . "</td>";
echo "<td>" . $row['daily_rate'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysql_close($con);
?>

Answer 1

Replace the code in SQL in that tutorial with this (and adapt the table and column names) one:
SELECT * FROM USERS where name ='qwert' and pass = MD5('1234')
And take care at sanitizing your variables in order to avoid SQL injection attacks !

Answer 2

You need to use a where clause
Also you will need to specify limits on the query to restrict the result set to 1 record
$select = "SELECT * FROM usertable WHERE username = '$user' LIMIT 0, 1";
$query = mysql_query($select) or die(mysql_error());
$result = mysql_fetch_assoc($query);
//Prints the array
print_r($result);