Retrieving data from database

[LBC]

One more thing. I changed the column in my database from "day" to "regular_days" and added another column named "random_days"

Then, with this line it should work to retrieve data from both and combine it into one array....right?

$count = $db->query("SELECT regular_days AND random_days FROM users WHERE regular_days= '?' OR random_days= '?'",array($days))->count();

But it doesnt
Any ideas?

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I did this now (well not me...but someone I know). It works!
But can you tell me if this will interfere with any User Spice stuff?

$count = $db->query("SELECT * FROM users WHERE regular_days = ? OR random_days = ?",array($days, $days))->count();

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That friend also says its much safer to do something like this:

$sql = 'SELECT regular_days random_days FROM users WHERE regular_days = :days OR random_days = :days';
$statement = $dbh->prepare($sql, array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY));
$statement->execute(array(':days' => 'Monday'));
$number_of_rows = $statement->fetchColumn();

Because with the statement we made earlier it is very easy to "kill the database"...he says.
Is that true?