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  1. I have an images table that has 5 foreign keys that reference 5 other tables, each of those tables uses the images table to store images, when an image gets uploaded, the foreign key in question gets a value associated with it in the images table but the other 4 foreign keys will get NULL values in that row. Is that acceptable, or should I rethink my database design? What would be the best way to go?
  2. In Chapter 19, the $_SESSION['customer_id'] variable is often used for things like isset($_SESSION['customer_id']) why though can't we use other table columns that are like customer_id in the $_SESSION[] for example $_SESSION['order_id'] In chapter 19 also, the $_GET['id'] is the same id as the customer's. Why is it the same? Where does it get declared as the same, I have searched through the scripts and I don't see it. I am trying to create a script where users can view their past orders. The trouble I am having is calculating the total amount of the order in the checkout.php scrip
  3. Hi Larry, I'd like to ask help with a problem that I am experiencing with an HTML table which is generated by PHP echos. When it renders in a browser, four spurious sem-colons appear at the top of the table - in Firefox they are aligned horizontally; in IE9 they are aligned vertically, both on the left hand side of the area immediately above the table itself. Maybe relatedly the table has four columns. It does not need or have a header but I have tried adding blank <th></th> pairs but it makes no difference. The table itself renders perfectly. echo '<table&g
  4. Version 0.5 Loading a Single Model The following two examples work together. The second calls the first. I believe the purpose is to retrieve a record from a table. And I believe each occurrence of $id represents the primary key value of the particular record we want. My question is, how do these functions know which table to search in? page 136: public function loadModel($id) { $model = Page::model()->findByPk($id); if ($model===null) { throw new CHttpException(404, 'The requested page does not exist.'); } Page 139: public function actionView($id){ $this->render('
  5. I have a MySQL database model where I have different types of users, each having common field names, like 'username', 'password', 'first_name', 'last_name', etc. etc. I've designed it so that these common fields are stored in a 'base' table called 'users' and specific fields that apply to each type of user are stored in derived 'sub-tables' for each type of user. Here is what it looks like: I know that this is a better design than having the 'common' fields stored in every 'user' table. The problem I'm having is I'm trying to figure out how I'm going insert a new user. What
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