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Session-level variables are implicitly created when they are initially referenced in SQL statements using double ampersand substitution They persist or remain available for the duration of the session or until they are explicitly undefined A session ends when the user exits their client tool like SQL*Plus or when the user process is terminated The problem with persistent session variables is they tend to detract from the generic nature of statements that use ampersand substitution variables Fortunately, these session variables can be removed with the UNDEFINE command Within a script or at the command line of SQL*Plus or SQL Developer, the syntax to undefine session variables is

Command line arguments are available to any script via the @ARGV array You can access this directly, either by referencing individual elements or by using the shift and pop functions The important thing to remember about the @ARGV array is that unlike many other languages (most notably C/C++), element zero is not the name of the script This is contained in the $0 variable This means that the first argument is at index zero, and therefore you can print out the entire command line argument list by printing the array:

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is one of the most exciting languages we ve worked on and with. Most languages have strengths and weaknesses, but once in a while a new language comes along that meshes well with the hardware, software, and programming approaches of a specific time. We believe C# is such a language. Of course, language choice is often a religious issue. 1 We ve structured this book as a tour through the language, since we think that s the best and most interesting way to learn a language. Unfortunately, tours can often be long and boring, especially if the material is familiar, and they sometimes concentrate on things you don t care about while overlooking things you re interested in. It s nice to be able to short-circuit the boring stuff and get into the interesting stuff. To do that, there are two approaches you might consider: To start things off quickly, skip to 3, which is a quick overview of the language and which gives enough information to start coding. To get a comparison of the language, skip to 42, which offers language-specific comparisons for C++, VB, and Java for programmers attuned to a specific language or for those who like to read comparisons. After reading those chapters, you can then return to the beginning of the book or read each chapter in the order that interests you.

print join(' ',@ARGV),"\n";

UNDEFINE variable;

You can also use shift to take off individual arguments in sequence:

Consider a simple generic example that selects a static and variable column from the EMPLOYEES table and sorts the output based on the variable column:

$filein = shift; $fileout = shift;

16:

select last_name, &&COLNAME from employees where department_id=30 order by &COLNAME;

Note, though, that this technique only works when you use shift in the main script block; calling it within a subroutine takes values off the @_ array instead It can also sometimes be necessary to put arguments back onto the command line before it is processed, perhaps to insert default or required options Because the command line arguments are simply available as the @ARGV array, you can push or unshift elements onto the command line For example:

At this point, you re probably asking yourself, why should I learn another language Why not use C++ (or VB or Java or whatever your preferred language is) At least, you were probably asking yourself that before you bought the book. Languages are a little bit like power tools. Each tool has its own strengths and weaknesses. Though we could use a router to trim a board to length, it d be much easier to use a miter saw. Similarly, we could use a language such as LISP to write a graphics-intensive game, but it d probably be easier to use C++. C# (pronounced C sharp ) is the native language for the .NET common language runtime (CLR). It has been designed to fit seamlessly into the .NET CLR. You can (and, at times, you should) write code in either Visual C++ or Visual Basic, but in most cases, C# will likely fit your needs better. Because the CLR is central to many things in C#, 2 introduces the important parts of it at least, those that are important to the C# language.

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