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The Oracle Database 11g Sample Schemas
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The examples in this appendix use the demo schemas provided by Oracle as part of the Oracle Database 11g server software. The demo data is for a fictitious company and contains the following five schemas: HR is the human resources division, which contains information on employees. It is the most commonly used schema, with its familiar employees and dept tables. The schema uses scalar data types and simple tables with basic constraints. OE is the order entry department, which contains inventory and sales data. This schema covers a simple order-entry system and includes regular relational objects as well as objectrelational objects. Because the OE schema contains synonyms for HR tables, you can query HR s objects from the OE schema. PM is the product media department, which covers content management. You can use this schema if you re exploring Oracle s Multimedia option. The tables in the PM schema contain audio and video tracks, images, and documents.
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APPENDIX ORAC LE DATABA SE 11G S QL A ND PL/SQL: A BRIEF PRIMER
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IX is the information exchange department in charge of shipping using various B2B applications. SH is the sales history department in charge of sales data. It is the largest sample schema, and you can use it for testing examples with large amounts of data. The schema contains partitioned tables, an external table, and Online Analytical Processing (OLAP) features. The SALES and COSTS tables contain 750,000 rows and 250,000 rows, respectively, as compared to 107 rows in the employees table from the HR schema. In order to install the SH schema, you must have the partitioning option installed in your Oracle database; this option lets you use table and index partitioning in your database. Ideally, you should install the Oracle demo schemas in a test database where you can safely practice the parts of SQL you aren t familiar with. The Oracle Sample Schemas documentation manual provides detailed information about the sample schemas. If you ve created a starter database using the Database Configuration Assistant (DBCA) as part of your Oracle software installation (the Basic Installation option), it will have automatically created the sample schemas in the new starter database. If you ve chosen to not create the starter database (by selecting a Software Only installation option), you can run the DBCA to install the sample schemas. Choose the Sample Schemas option when you use the DBCA to create the sample schemas in an existing database. By default, all the sample schema accounts are locked, and you must use the ALTER USER . . . ACCOUNT UNLOCK statement to unlock them. If you want to create the sample schemas in a database without using the DBCA, you can run Oracle-provided scripts to install the sample schemas.
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Oracle Data Types
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Data in an Oracle database is organized in rows and columns inside tables. The individual columns are defined with properties that limit the values and format of the column contents. Let s review the most important Oracle built-in data types before we look at Oracle SQL statements.
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Character Data Types
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The CHAR data type is used for fixed-length character literals: SEX CHAR(1) The VARCHAR2 data type is used to represent variable-length character literals: CITY VARCHAR2 (20)
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The CLOB data type is used to hold large character strings and the BLOB and BFILE data types are used to store large amounts of binary data.
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There are two important SQL data types used to store numeric data: The NUMBER data type is used to store real numbers, either in a fixed-point or floating-point format. The BINARY FLOAT and BINARY DOUBLE data types store data in a floating-point format.
A PPEN DI X O RA CLE D AT A BASE 11G S Q L AND PL/S QL: A BRI EF PRIME R
Date and Time Data Types
There are a couple of special data types that let you handle date and time values: The DATE data type stores the date and time (such as year, month, day, hours, minutes, and seconds). The TIMESTAMP data type stores time values that are precise to fractional seconds.
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