Beginning Oracle SQL, 3rd Edition: For Oracle Database 12c by Lex deHaan, Tim Gorman, Inger Jorgensen, Melanie Caffrey

By Lex deHaan, Tim Gorman, Inger Jorgensen, Melanie Caffrey

Starting Oracle SQL is your advent to the interactive question instruments and particular dialect of SQL used with Oracle Database. those instruments contain SQL*Plus and SQL Developer. SQL*Plus is the single software any Oracle developer or database administrator can continuously expect, and it really is frequent in growing scripts to automate regimen initiatives. SQL Developer is a robust, graphical setting for constructing and debugging queries. Oracle's is in all probability the main necessary dialect of SQL from a occupation perspective. Oracle's database engine is widespread in company environments world wide. it's also present in many govt functions. Oracle SQL implements many positive aspects no longer present in competing items. No developer or DBA operating with Oracle can come up with the money for to be with out wisdom of those positive aspects and the way they paintings, as a result functionality and expressiveness they carry to the desk.

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Comments after two minus signs are implicitly ended by a newline character; comments between /* and */ can span multiple lines. See Listing 2-1 for two examples. info Chapter 2 ■ Introduction to SQL and SQL Developer Listing 2-1. SQL Comments Examples /* this text will be considered a comment, so the Oracle DBMS will ignore it ... */ -- and this text too, until the end of this line. Listing 2-1 shows how you can add comments to SQL commands. Note that you can also add comments to database objects with the COMMENT command.

The REVOKE command syntax diagram Besides the two standard SQL commands mentioned in this section (GRANT and REVOKE), Oracle supports several additional commands in the security and data access area; for example, to influence the locking behavior of the DBMS, to implement auditing, and to set up more detailed user authorization. 2 Basic SQL Concepts and Terminology This section discusses the following topics: • Constants (literals) • Variables • Operators, operands, conditions, and expressions • Functions • Database object names • Comments • Reserved words Constants (Literals) A constant (or literal) is something with a fixed value.

Figure 2-4 shows the syntax diagram for REVOKE. Figure 2-4. The REVOKE command syntax diagram Besides the two standard SQL commands mentioned in this section (GRANT and REVOKE), Oracle supports several additional commands in the security and data access area; for example, to influence the locking behavior of the DBMS, to implement auditing, and to set up more detailed user authorization. 2 Basic SQL Concepts and Terminology This section discusses the following topics: • Constants (literals) • Variables • Operators, operands, conditions, and expressions • Functions • Database object names • Comments • Reserved words Constants (Literals) A constant (or literal) is something with a fixed value.

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