By Benjamin Rosenzweig, Elena Silvestrova
Examine PL/SQL hands-on, via useful workouts, self-review questions and real-world solutions. This ebook teaches all of the Oracle PL/SQL abilities you wish, via hands-on, real-world labs, routines, initiatives, and our nice Web-based education web site! assurance contains each key Oracle PL/SQL thought, together with: the fundamentals of established programming; PL/SQL constitution and syntax; iterative keep watch over; scoping and anchored datatypes; SQL inside PL/SQL; for replace cursors and subprograms; kept code, triggers, safety, tables, even advanced-level package deal and parameter passing suggestions. A loose Web-based education module incorporates a digital examine living room the place readers can have interaction with the writer. As Oracle's most suitable device for construction shop tactics, PL/SQL uniquely vitamins the normal relational database language, SQL, with the gains had to construct real-world purposes. Oracle builders in most cases study SQL sooner than venturing in to Oracle's PL/SQL. SQL is the root Language on which PL/SQL is construct.
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Additional info for Oracle PL/SQL Interactive Workbook (2nd Edition)
The most common default shell prompt in Linux is the $ character (the dollar sign). For this reason, most of examples in this book denote the shell command line with the $ character. The # character (the hash) will be used for the prompt to denote operations that need to be performed as the root user. Figure 2-1 shows a typical screen where you type commands. fm Page 22 Tuesday, September 23, 2008 12:40 PM 22 CHAPTER 2 ■ 2-1. RUNNING PREV IOUSLY ENTERED COMM ANDS Figure 2-1. Typical shell prompt ready to accept command input In this chapter, we cover Linux topics such as obtaining information about your shell environment and customizing it.
As you scroll through previously run commands, you can rerun a desired command by pressing the Enter or Return key. fm Page 23 Tuesday, September 23, 2008 12:40 PM CH A PT ER 2 ■ 2-1. RUNNI NG PRE VIO USLY ENT ERED C OM MAN DS If you want to edit a command, use the Backspace key to erase characters, or use the left arrow to navigate to the desired location in the command text. After you have scrolled up through the command stack, use the down arrow to scroll back down through previously viewed commands.
Automatically Completing Long Commands Problem You get tired of typing long commands. You wonder whether there is some way the Bash shell can automatically fill in the text for long command strings. Solution The Tab key can be used for command completion. fm Page 26 Tuesday, September 23, 2008 12:40 PM 26 CHAPT ER 2 ■ 2-3. ora file with the vi utility. ora Now you can press the Enter or Return key to edit this file. One thing to note is that you can use this technique on any program, directory, command, or file.