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Hi again everyone, and welcome to unit 4. We've reached a very important stage in
our course. And I believe this is one of the most popular units I have found with
most students. In this unit we're going to learn how to effectively search and
locate material from the library database resources. To begin with let's
do a little recap of the search techniques we learned in the previous
unit. You recall the good old boolean operators: and, or, not. "And" is used to
combine two terms in a search in which both terms need to be located or used in
a particular document, in order for it to be retrieved in results. In our example
here, endangered species "and" global warming, will retrieve only the green
articles, that use both of those terms. So as you can see using "and" is an effective
term to use in order to limit the number of your search results. On the other hand
"or" is used to combine two subject terms in which either or both terms are used in
particular article. In our example, corn ethanol "or" corn fuel, will retrieve all
the articles that use either one of those terms. So as you can see "or" is a
useful operator to use if you want to expand or increase the number of your
search results. And finally "not" is used to exclude a particular term from your
subject search. In our example, Miami Dolphins "not" football, will exclude all
the white area or football subject articles. Next let's review truncation and
wildcard symbols. As you recall, the truncation symbol is usually represented
by the asterisk, which is added to the end of a word in order to indicate to the
database to search all the variant forms of a particular subject. So in our
example here, teen*, will retrieve all articles from the subject: teen,
teens, teenager, teenagers, teenaged.
The wild-card symbol, which is usually
represented by the question mark or pound sign, depending on the database,
is used to replace a particular character, in order to retrieve all the variant
forms of a particular word. In our example wom?n, will
retrieve articles on the subject "women", as well as "woman". Now let's move our
discussion specifically to the library databases. To begin with I should
explain that the library databases offer access to a wide variety of material:
ebooks, reference books, like encyclopedias, full-text articles from
magazines, journals, newspapers. and various other resources. In addition
there's a variety of types of databases. As you can see we have specialized
subject databases, if you want to focus your research on a
literature topic, or fashion, or business, we have specialized subject databases.
In addition we have many general databases. The general databases are useful to
search for full-text articles from journals, newspapers, and magazines on
any topic. And next in this unit we're going to learn about the specialized
features that the databases offer in order to assist you with your search. As
an example you can see that the databases offer you the ability to limit to
simply full-text articles, to a date range of articles, as well as a specific
publication type. So as you can see we have quite a bit to cover in this unit
so if you're ready let's get started.
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