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Now we can add rows to the nested table, as shown in Listing 12-10. Note that you can access nested tables only within the context of the table they are part of; it is impossible to access them as independent tables. Listing 12-10 uses the TABLE function again, just as we did before in Listing 12-6, to unnest the nested table. Listing 12-10. Inserting Rows into the Nested Table insert into table ( select errata from c where code = 'SQL') values ('SQL' , 3 , 45 , 'Typo in last line.'); We inserted an erratum entry for the SQL course, 3, page 45. In a similar way, you can also delete rows from a nested table. As stated in the introduction to this section, nested tables offer more flexibility than arrays. For example, you can update individual column values of a nested table, whereas you can only replace arrays in their entirety. Suppose we made a typo in Listing 12-10 while entering the chapter number: the erratum was not in 3, but rather in 7. Listing 12-11 shows how we can correct this mistake with an UPDATE command. Note that line 3 introduces tuple variable e ranging over the result of the TABLE function, allowing us to use that tuple variable on the fourth line to refer to its chapter (CH) column value. Listing 12-11. Updating Individual Columns of Nested Tables update table ( select errata from c where code = 'SQL') e set e.ch = 7;

If you want to retrieve all errata entries for the SQL course, you can join the course s table (C) with its nested table, as shown in Listing 12-12. Listing 12-12. Selecting Errata for the SQL Course select , , from code c.description e.ch, e.pg, e.txt c join table(c.errata) e using (code); DESCRIPTION -----------------------------TXT -----------------------------Introduction to SQL Typo in last line.

MojoMojo is a sophisticated web application that requires some effort to install and configure. Despite the extra work, MojoMojo has a number of features that make it an attractive proposition. It supports all of the popular wiki markup syntaxes (and Perl s POD format) with live markup. It doesn t require disambiguation pages like other wikis, as it stores data in a tree structure (e.g., /plants/Paris vs. cities/Paris), but it also supports tagging for entries that

Opticon created a cross-reference file based on the options selected from the Imagebase dialog. This file is displayed in Figure 14-19. Note that use of the letter Y on the first and seventh lines, to denote the beginning of a new document. The first and seventh lines also contain the total number of pages per document: 6 and 3, respectively.

As Listing 12-12 shows, this nested table join syntax is very similar to the syntax you use for regular joins (discussed in 8). The TABLE function unnests its column-valued argument (c.errata) into a table. Note that you can only refer to c.ERRATA because you specify the C table first in the FROM clause. The FROM clause order is important in this case. If you swap the two table expressions, you get the following Oracle error message: code c.description e.ch, e.pg, e.txt table(c.errata) e join c using (code); from table(c.errata) e * ERROR at line 4: ORA-00904: "C"."ERRATA": invalid identifier Listing 12-12 shows only a single row, because we inserted only a single erratum into the nested table. The last section of this chapter revisits nested tables, showing how you can use multiset operators on nested tables. These multiset operators could be a reason to consider using nested tables instead of regular (relational) tables with primary key and foreign key constraints. The multiset operators allow you to write elegant SQL statements that would need quite complicated syntax without them. select , , from

In a valid cross-reference file, the characters on each row of data from the beginning of a line to the first comma represent an image s key, or alias. The option Use production numbers as new image keys was enabled on the Numbering dialog of the wizard. This caused the first eight characters of each line in the file Opticon.log to be the same as the production numbers created during processing. If this option had not been selected, the characters occupying this position in the file would be based on the BEGDOC values in the HIST_DOCS.DCB database. Rerunning the production using the exact same options, but with the Use production numbers as new image keys option disabled, would create the cross-reference file displayed in Figure 14-20.