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You can use Auto actions to short-circuit the dispatch process, jumping either to the End action or to Catalyst s finalization stage.

Listing 8-26. HAVING Clause Example select from group having deptno, count(empno) employees by deptno count(*) >= 4;

Next document [Ctrl+PgDn]: Advances to the first image of the next document. If there s no document record after the current one, clicking this button will have no effect. Previous document [Ctrl+PgUp]: Retreats to the first image of the previous document. If there s no document record before the current one, clicking this button will have no effect. Next Folder [Shift+PgDn]: Advances to the first image of the first document in the next folder, if folder breaks have been loaded into a database s imagebase. Previous Folder [Shift+PgUp]: Retreats to the first image of the first document in the previous folder, if folder breaks have been loaded into a database s imagebase.

DEPTNO COUNT(EMPNO) -------- -----------20 5 30 6 However, the SQL language allows you to write queries with a HAVING clause without a preceding GROUP BY clause. In that case, Oracle assumes an implicit GROUP BY on a constant expression, just as when you use group functions in the SELECT clause without specifying a GROUP BY clause; that is, the full table is treated as a single group.

Figure 7-1. Flowchart representing the Catalyst request cycle from the initial request to serving the document to the client (Source: Catalyst Wiki: http://dev.catalyst.perl.org/wiki/)

It is important to distinguish the WHERE clause from the HAVING clause. To illustrate this difference, Listing 8-27 shows a WHERE clause added to the previous query. Listing 8-27. HAVING vs. WHERE select from where group by having deptno, count(empno) employees bdate > date '1960-01-01' deptno count(*) >= 4;

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Before Catalyst works out the dispatch logic, the request is prepared via the prepare method in Catalyst.pm. The first thing done to prepare the request is to corral all of the information from the engine into the context object (usually $c, or if you re overriding a method in MyApp.pm, you ll want to call it $self, which we do in the The Chained Dispatch Type section of this chapter). First, prepare gathers all the information from the latest request from the current engine (be that the built-in server, FastCGI, mod_perl, or others) and assigns it into the context object. The methods called during this process are as follows. These methods all need to apply rules for the specific engine currently under use in order to work properly. prepare_request prepare_connection prepare_query_parameters prepare_headers prepare_cookies prepare_path prepare_read

DEPTNO COUNT(EMPNO) -------- -----------30 5 The WHERE condition regarding the day of birth (line 3) can be checked against individual rows of the EMPLOYEES table. On the other hand, the COUNT(*) condition (line 5) makes sense only at the group level. That s why group functions should never occur in a WHERE clause. They typically result in the following Oracle error message: ORA-00934: group function is not allowed here. You ll see this error message in Listing 8-29, caused by a classic SQL mistake, as discussed shortly.