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He is the second longest standing member of the Catalyst core team, the founder of the DBIx::Class ORM project, a Moose advocate since the early days of the object system, and a PAUSE administrator with a focus on helping find new maintainers for abandoned CPAN modules Occasionally he finds time to write other CPAN modules and then inflict their maintenance on other members of the community, such as Devel::REPL, the interactive Perl shell, and Devel::Declare, the syntax extension system underlying MooseX::Declare and Method::Signatures::Simple Matt runs the technical team at Shadowcat Systems Limited, an open source consultancy specializing in helping clients with design, development, and deployment of Catalyst and DBIx::Class-based applications.

You can add columns or constraint definitions to an existing table with the ADD option. The MODIFY option allows you to change definitions of existing columns. For example, you can widen a column, allow null values with NULL, or prohibit null values with NOT NULL. You can drop columns from tables with the DROP COLUMN option. You can also set columns to unused with the ALTER TABLE ... SET UNUSED command, and physically remove them from the database later with the ALTER TABLE ... DROP UNUSED COLUMNS command. This may be useful when you want to drop multiple columns in a single scan (accessing the rows only once). The RENAME COLUMN option allows you to change the name of a column.

As with popular Web search engines, you can use basic operators such as and, or, and not to perform more complex searches. Entering Smith not Brown in the <Quick Search> text field locates those records that contain the name Smith, but that don t also contain the name Brown. A more complete family of operators exists, and is discussed in greater detail in 9. Some of these operators are appropriate for full text, while others are appropriate with coded fields, specifically comparison operators. A DATE_CREATED field, designated with a date data type, supports the search DATE_CREATED >= "1/1/2002", so that only records created on or after that date are retrieved.

Caution You should be careful with the destructive DROP COLUMN option. Some database applications may depend on the existence of the column you are dropping.

When occasionally not in front of his computer, he can be found playing Dungeons & Dragons, producing a blur of hair on the dance floor at goth and metal clubs, or lurking in the corner of a pub consuming copious quantities of real ale..

With the constraint manipulation option, you can remove, enable, or disable constraints. Figure 74 shows the syntax details of this ALTER TABLE command option. For more details about constraint handling, see the next section.

The manufacturers of Concordance have designed the software so that a single Concordance database can house up to 33,554,431 individual documents, where the full text of each individual document (collection of pages) can contain up to three billion individual characters. These are the maximum limits of a Concordance database, and are not feasible in practice. To ensure speedy search and retrieval, a Concordance database should be capped off at roughly 18 million documents. This doesn t mean that Concordance ceases being a viable alternative for a situation that calls for more than 18 million documents. Concordance includes methods to join separate databases together so that they appear as one virtual database, a method known as concatenation. There are also administrative methods to keep the full text of documents intact, but to minimize the size of the individual data files that comprise a Concordance database.