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s Note You can set document, folder, and box breaks from the Edit tab of the Imagebase Management dialog. You open this dialog by selecting Tools Imagebase Management; it s described in 13. You can also specify breaks in an imagebase load file, covered in 13.

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Listing 8-24. Count Employees Per Department (Third Attempt) select deptno, count(e.empno) from employees e right outer join departments d using (deptno) group by deptno; DEPTNO COUNT(E.EMPNO) -------- -------------10 3 20 5 30 6 40 0 At the end of 5, you saw an example of a PL/SQL stored function to count all employees per department (Section 5.8, Listing 5-31). In that chapter, I mentioned that this counting problem is not trivial to solve in standard SQL. In Listings 8-22, 8-23, and 8-24, you see that you should indeed be careful. You need an outer join, and you should make sure to specify the correct argument for the COUNT function to get correct results.

Catalyst will search your controller heiarchy for the action that most specifically matches the URL. If not Path, Regex, Global, or Local action matches, Catalyst walks back up the controllers treating unused trailing URL path parts as parameters and eventually looks in your main application package.

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While you use a Concordance database to navigate quickly through document records, you can use Opticon to navigate quickly within the pages that define a document. Opticon can also navigate through document records, and if configured properly, can navigate through entire folders containing documents as well. However, at any given time, the contents of the Opticon window correspond to a single image representing a single page. When Opticon is set as Concordance s default viewer, and is launched from Concordance, administrators and end users should be aware that Concordance and Opticon synchronize. Only those images represented by database records accessible in the last active query in Concordance are accessible to Opticon. Several options exist within Opticon to assist you when navigating through pages, documents, and folders. All these options are accessible from Opticon s Page menu. Several buttons on the Image toolbar also assist you in navigation.

Caution You should be careful with the COUNT function, especially if null values might cause problems (since group functions ignore them) and you want to count row occurrences.

The same most specific match routine is used by Catalyst when locating a Default action or the optional Begin and End actions. A Default action is passed all the URL path parts as parameters. Only one Begin and End method will be called that which is closest to the chosen dispatch, or Default

The following bulleted list explains navigation menu items These menu items have keyboard shortcuts, which are displayed next to the menu item in square brackets First [Ctrl+Home]: Retreats to the first image in a set of images that define a document If the current image is the first image, selecting this menu item will have no effect Next [PgDn]: Advances to the next image in a set of images that define a document If the current image is the last image of a document record, Opticon will advance to the first image of the next document (if any) When this menu item causes Opticon to cross document boundaries, the Concordance database that launched Opticon will update The document record corresponding to the next image is made current and active if you enable the Synchronize paging with Concordance check box on the General tab of the Preferences dialog.

If your queries contain a GROUP BY clause, some syntax combinations are invalid and result in Oracle error messages, such as the following: ORA-00937: not a single-group group function. This always means that there is a mismatch between your SELECT clause and your GROUP BY clause. To demonstrate valid versus invalid syntax, Table 8-3 shows one invalid and three valid syntax examples. Table 8-3 assumes you have a table T with four columns A, B, C, and D.

select a, b, max(c) from t ... group by a select a, b, max(c) from t ... group by a,b select a, count(b), min(c) from t ... group by a select count(c) from t ... group by a