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In summary, if your query contains a GROUP BY clause, the SELECT clause is allowed to contain only group expressions. A group expression is a column name that is part of the GROUP BY clause, or a group function applied to any other column expression. See also Table 8-3 at the end of Section 8.6.

Note that the length attribute is a read-only attribute that is, we cannot assign a value to it explicitly, perhaps in an attempt to enlarge an array at run time (recall that this isn t possible: an array, once sized, cannot be expanded). If we try to do so, as in the following snippet: int[] x = new int[3]; // Let's naively try to enlarge array x! x.length = 10; we d get the following compilation error: cannot assign a value to final variable length

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If a Web page sends out the appropriate headers, your browser will use the local cached copy for subsequent requests to that page, without even contacting the Web page again to see whether it has changed Upstream caching is a nice efficiency boost, but there s a danger to it The content of many Web pages differs based on authentication and a host of other variables, and cache systems that blindly save pages based purely on URLs could expose incorrect or sensitive data to subsequent visitors to those pages For example, say you operate a Web-based e-mail system, and the contents of the inbox page obviously depend on which user is logged in If an ISP blindly cached your site, then the first user who logged in through that ISP would have his or her user-specific inbox page cached for subsequent visitors to the site That s not cool.

We also have to take care when stepping through an array of object references to avoid land mines due to empty/null elements. That is, if we re iterating through an array, but the array isn t completely filled with Student object references, then our invocation of the getName method will fail as soon as we reach the first empty/null element, because in essence we d be trying to talk to a nonexistent object. Let s look at an example: // When we first instantiate an array of object references, all cells contain the // value null. Student[] students = new Student[3]; // Store a Student object reference in cells 0 and 1, but leave // cell 2 empty (i.e., it retains its default value of null). students[0] = new Student("Elmer"); students[1] = new Student("Klemmie"); // Try to step through the array, printing each Student's name. // There's a "land mine" lurking at element 2!!! for (int i = 0; i < studentBody.length; i++) { System.out.println(studentBody[i].getName()); } If this code were executed, we d get the following run-time error message as soon as the value of i reached the value 2: Exception in thread "main" java.lang.NullPointerException because the value of studentBody[2] is null; we cannot invoke a method on (i.e., talk to ) a nonexistent object.

The previous sections showed examples of using standard GROUP BY clauses. You can also use some more advanced features of the GROUP BY clause. Here, we will look at GROUP BY CUBE and GROUP BY ROLLUP. Let s start with a regular GROUP BY example, shown in Listing 8-36. Listing 8-36. Regular GROUP BY Example select , from group by DEPTNO -------10 10 10 20 20 30 30 30 deptno, job count(empno) headcount employees deptno, job; JOB HEADCOUNT ---------- --------MANAGER 1 DIRECTOR 1 ADMIN 1 MANAGER 1 TRAINER 4 MANAGER 1 SALESREP 4 ADMIN 1

Fortunately, HTTP provides a solution to this problem A number of HTTP headers exist to instruct upstream caches to differ their cache contents depending on designated variables, and to tell caching mechanisms not to cache particular pages We ll look at some of these headers in the sections that follow..

There s a simple way to avoid such land mines in an array: simply test the value of a given array element to see if it s null before attempting to address the object at that location: // Step through all elements of the array. for (int i = 0; i < studentBody.length; i++) { // Check for the presence of a valid object reference before trying to // "talk to" it via dot notation. if (studentBody[i] != null) { System.out.println(studentBody[i].getName()); } }

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