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  1. or download this
    my $sth = $dbh->prepare('Select * from users where name = "$name"');
$sth->execute();
  2. or download this
    my $var   = "Hello";
my $other = '$var world';   # Wrong.
my $outro = '"$var" world'; # Still wrong.
my $right = "$var world";   # Correct.
  3. or download this
    my $sth = $dbh->prepare( 'SELECT * FROM users WHERE name = ?' );
$sth->execute( $name );