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Points arising from the foregoing definitions: Observe that the variable reference V stands for the variable V itself in a target position (in particular, on the left side of an assignment) and for the current value of that variable in a source position (in particular, on the right side of an assignment). It follows that after the assignment V := v; the comparison V = v gives TRUE.5 The operators = and := are both polymorphic. Again, I hope to discuss this topic in a later paper.

I ve now discussed types at some length (and said quite a bit about operators, too); it s time to turn to the other two core concepts, values and variables Here are some definitions: Definition: A value is an individual constant (for example, the individual constant 3) Values have no location in time or space However, values can be represented by certain encodings, and of course such encodings do have location in time and space (see the definition of variable below) Indeed, the very same value can have many distinct encodings (in general), and each of those encodings can appear at many distinct locations in time or space (again in general) meaning, loosely, that any number of distinct variables can have the same value, at the same time or different times.

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During a team build, the sources are labeled; this is the target before that process If you modified any file previously in the build process, you could check them all in at this point Called after the source tree has been labeled Called before the projects are compiled Invoked after the projects have been compiled This is called before the test cases in the projects are executed If there were extra steps to set up your test cases, you could implement those steps in this target If you would like for some actions to take place after the tests are completed, such as creating summaries of the tests, then you could implement those here This target is to assist you in deployment; if you wanted to create a zip file of the binaries (or CAB files), you could do that here.

Note that, by definition, values can t be updated (because if they could, then after such an update they wouldn t be the same value any longer, in general) Definition: A variable is a holder or container for an appearance of an encoded representation of a value ( an appearance of a value, or just an appearance, or even informally just a value, for short) Variables do have location in time and space If variable V currently holds an appearance of value v, v is said to be the current value of V (a variable can t hold more than one value at any given time); 6 equivalently, V is said to have v as its current value Also, of course, variables, unlike values, can be updated that is, their current value can be replaced by another value, probably different from the previous one.

Such skills will serve you well later on If your current role does not allow for you to take on additional tasks that may be DBArelated, then go find one of the DBAs at work and ask them how you can get started Most DBAs are always willing to help someone else learn more about the system; doing so means less support work when they are called upon to fix your mistakes! Most DBAs are both driven and lazy; this means that we are always looking for ways to make our lives easier One way is to help train people on how to do their jobs better What if there is nothing for you to help with at work You can look to volunteer your time Many charitable organizations need people to donate their time.

(Of course, the variable in question is still the same variable after the update) These definitions are based on ones given in An Introduction to Data Types, by J Craig Cleaveland (Addison-Wesley, 1986) I hope you agree they re straightforward enough, even if they might seem a little wordy Yet they have a wealth of implications, not all of which are immediately obvious, at least if the existing literature is anything to go by Here are a few that are worth mentioning right away:.

5. The fact that successful assignment of some value v to some variable V makes the comparison V = v evaluate to TRUE is known as The Assignment Principle. Although it sounds trivial, that principle has far-reaching consequences (unfortunately beyond the scope of the present chapter). 6. It can t hold less than one, either! so long as it s in existence. In other words (although the point is somewhat tangential to the main purpose of this chapter), I reject the concept of uninitialized variables.

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