Wildcards and Truncation are useful tools for expanding a search to include multiple spellings or various endings to search terms. Use them carefully. Expanding a search could generate more results than can be easily dealt with. Before using these symbols, check with the database. Some sources have different rules regarding the use of these symbols.
The most commonly used Boolean Operators in Database searching are AND, OR, NOT.
AND is used when you have two or more required search terms. This function is a limiter in that it only produces those sources that contain all of the required search terms, eliminating those that only contain one.
OR is used when you have multiple search terms and you want all sources that contain at least one of these terms. This function is an expander, it creates a search result much larger than using just one term alone would produce.
NOT is also a limiter, in a different way than already mentioned. This function is added to a search result in order to eliminate sources that contain a specific term. It is used to focus the results of a large search by removing unwanted results.
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