Question

This query is not working for me. Where have I done mistake. Please help

$sql="SELECT * FROM $tbl_name WHERE ( username='$myusername' and (password='$mypassword' and password='$encrypted_mypassword'))";

Answer 1

Untested, but this should work,

$sql="SELECT * FROM $tbl_name WHERE 
Username = '$myusername' AND
Password = '$mypassword' AND
Password = '$encrypted_mypassword'";

For what you are doing brackets are not required, and you are also trying to compare a single field to possibly 2 different values.