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A schema is a uniquely named set of objects and data owned by an individual user. Most usage of SQL takes place at the object level and below. Objects include tables, views, modules, and routines (such as stored procedures, which are used in 9). SQL objects consist of one or, usually, more columns. A typical database table will consist of several columns, each of which contains, for each row, a piece of data of a particular data type. Data types may be domain-defined, which are standard SQL-recognized data types, or may be defined by a user, which are user-defined data types. Each piece of data in a column must comply with the constraints on its possible values imposed by the specified data type. Data types vary among vendors, but usually you will easily be able to identify a data type in any RDBMS, which corresponds to a SQL99 data type. In the sections in this appendix, we will look primarily at how to use SQL to work with table objects, and to execute queries that select data from one or more columns in one or more tables. First, let s briefly look at the data types that are recognized in SQL99.

Brightness and contrast are basic parameters that allow changing how the light is represented in the image. Brightness controls the total amount of light present in the scene. Increasing it produces an overall lighter image, and decreasing it, an overall darker image. Contrast is how far apart the darkest shadow and the brightest light are represented in the image. Increasing it results in darker shadows and brighter lights, obtaining a large visual separation between dark and light areas in the image; decreasing it makes shadows brighter and lights darker, resulting in a more uniform image. In Gimp, you can access the Brightness and Contrast controls by selecting Colors BrightnessContrast. In the dialog box that appears (see Figure 4-4), you can increase or decrease both the brightness and the contrast of the image.

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SQL data types are essentially constraints on the types of data that may be stored in a column and on how that data is actually stored in the RDBMS. Careful consideration of what data types are appropriate is an important part of the analysis and design of a new database. As with many aspects of RDBMS, the use of data types varies among RDBMS packages. Check the documentation to determine the precise rules.

4. 5.

String data is one of the most commonly used data types. String data of fixed length is specified using the CHAR keyword. For example, to declare the last_name column as accepting text of exactly 20 characters in length we could write:

For HTML rendered PDF files to illustrate embedded images, the administrator must also install GhostScript version 8.14 or later. Access Gateway Enterprise and Advanced Access Control were both tested on version 8.14. GhostScript can be downloaded from http://www.ghostscript.com/. After installing the application, the administrator must add the path to the bin directory where the Ghostscript executable is located to the server s environment variables PATH. (A reboot of the server may be necessary at this point.)

last_name CHAR(20)

Such declarations are used when creating columns for tables, as described in the next section. A CHAR declaration commonly is padded with spaces to the stated number of characters if the user-supplied string is shorter. Commonly, a character string is declared to be of variable length. For example, to declare the last_name column as being a variable-length string up to 20 characters in length we could write:

scanf("%d%d", &r, &c);

last_name VARCHAR(20)

This is a unidirectional connection only the server can send the multimedia information on this connection back to the client. The server builds this connection to the client. The second UDP connection setup uses RTCP (Real-Time Control Protocol). This is a bi-directional connection that the client uses to synchronize the multimedia connection as well as to request any missing UDP segments from the multimedia server. The restriction on this port number is that it must be one number greater than that used by the RTP multimedia connection; therefore, it will always be an odd number. As with the last UDP connection, the server builds this connection to the client.

Some database packages use LONG, TEXT, or MEMO in place of VARCHAR. A VARCHAR is stored more efficiently than a CHAR in terms of disk space, but performance during sorts of VARCHAR data is likely to be slower. Some database systems don t allow indexes to be created on VARCHAR data types, which further impacts performance. In addition, the NCHAR and NVARCHAR data types support multi-byte or Unicode characters. All string data types, when referred to in SQL code, must be surrounded by paired apostrophes.

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