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EXISTS answers the question, is this value present in the specified table column If that value is present (as indicated by at least one row being returned from the subquery), the answer is yes and the EXISTS expression evaluates to TRUE As NULLs cannot be equated, joining a NULL mgr to a NULL empno does not return TRUE Essentially, the query joins the inner and outer tables and returns the rows that match, one at a time If the main query value does not have a match in the subquery (ie, the join does not return at least one row), then the EXISTS evaluates to FALSE IN answers the question, does the value exist anywhere in this list If one list value matches the external value, then the expression evaluates to TRUE.

One way to think of an IN list expression is to rephrase it as a series of OR expressions For example, the following: 1234 IN (1234, NULL) is equivalent to: 1234 = 1234 OR 1234 = NULL Each equality check can be evaluated separately and the result would be TRUE OR UNKNOWN Reference the truth table in 410 (in 4) TRUE OR UNKNOWN is TRUE Essentially, once you find a match, you can stop looking and ignore any previous NOT TRUE (FALSE or UNKNOWN) results If the value does not match at least one value in the list, then the expression returns FALSE..

Once the user has been loaded and verified, you want to keep the user information available on the requests that follow. The Catalyst authentication system handles this via the Catalyst Session plugin. Once the $c->authenticate() call succeeds, the user information is stored in the session, and the user is automatically available on each request after that. From that point on, you don t need to think too much about user persistence; the default authentication realm class handles the details for you. Each subsequent request will have $c->user automatically populated for you when you request it. You can test whether there is a user available by calling $c->user_exists(). This is good because in your action you can decide what to do based on whether or not you have an authenticated user. A common use of this ability would be to respond to a request with generic information when an unregistered user is accessing the page, but respond with personalized information when the user requesting the page is logged in, for example: if ( $c->user_exists() ) { @interests = $c->user->interests->all(); ## show customized information based on the user's interests } else { @interests = $items->most_popular(10); ## show top ten items to unknown users } ## do stuff with @interests Often, though, you ll want to go beyond answering the question Do I know who is requesting this action in your application. If you wanted, for example, to determine whether the user requesting the action is allowed to do so, you could certainly look at the user object, check the contents of the user_type field, and so on. It s likely not the first time you ve done that type of authorization checking. Thankfully, Catalyst makes that process a lot easier as well, using the concept of roles.

You print images from Opticon using the Print dialog. You can activate this dialog from the File Print menu, by pressing the Ctrl+P keyboard combination, or by clicking the Printer button on the Standard toolbar. This dialog has four tabs that control the appearance and number of images to print: Print, Header & Footer, Options, and Setup. The following sections describe each tab of the dialog in detail.

Intuitively, NOT EXISTS and NOT IN should return the rows in a table that are not returned by EXISTS and IN, respectively This is true for NOT EXISTS, but when NULLs are encountered, NOT IN will not return the rows not returned by IN In the previous section, we reported the employees where were also managers In this section, we want to report on the employees who are not managers, so NOT EXISTS and NOT IN are the expressions we can use Listing 9-13 shows the results from using NOT EXISTS Listing 9-13 Selecting employees who are not managers using NOT EXISTS select e1ename from employees e1 where not exists (select e2mgr from employees e2 where e1empno = e2.