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This schemacovers a simple order-entry system and includes regular relational objects as well as object-relational objects. OE is the order entry department, which contains inventory and sales data. The schemauses scalar data types and simple tables with basic constraints. It is themost commonly used schema, with its familiar employees and dept tables. HR is the human resources division, which contains information on employees. The demo data is for a fictitious company and contains the followingfive schemas: The Oracle Database 10g Sample SchemasThe examples in this appendix use the demo schemas provided by Oracle as part of the OracleDatabase 10g server software. Please refer to theOracle manuals, Application Developer's GuideFundamentals and PL/SQL Users Guide andReference, for a comprehensive introduction to SQL and PL/SQL. Oracle SQLand PL/SQL represent an enormously broad topic, so this appendix lightly covers several importanttopics without attempting any detailed explanation due to space considerations. This appendix aims to summarize some of the most important Oracle Database 10g SQL andPL/SQL features so you and the developers you work with can take advantage of them. Thereason is simple: even when you arent developing applications yourself, youre going to be assistingpeople who are doing so, and it helps to know what theyre doing. Its becoming increasingly important, however, for DBAs to learn a numberof advanced SQL and PL/SQL concepts, including the new Java and XML-based technologies. Your need to know SQL or PL/SQL depends somewhat on the type of DBA you area produc-tion support DBA wont need to know as much about Oracle programming as a DBA assisting indevelopmental efforts.
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My goal here is simply to pres-ent a short summary of the classic DML and DDL commands and to discuss the newer SQL andPL/SQL concepts in greater detail. However, I present in thisappendix a quick introduction to Oracle Database 10g SQL and its programmatic cousin, PL/SQL,as a starting point for those new to programming Oracle databases. Im sure most of you are already familiar with SQL to some extent. Oracle Database 10g SQL and PL/SQL: A Brief Primer