Once you have identified the keywords and phrases that describe your topic, the next step is to connect them in a logical way that the database will understand - this is accomplished with the use of Boolean operators: AND, OR, NOT.
Databases and many search engines including Google make use of Boolean operators. Understanding how databases interpret your keywords will allow you to execute more specific searches, thereby saving you time while retrieving more relevant results. A database's Help pages will indicate how to construct Boolean searches and which wild cards the database supports.
Boolean operators connect your search words together to either narrow or broaden your set of search results.
AND - narrows a search by finding records that contain all the terms you have entered.
OR - broadens a search by finding records that contain either or all of the terms you have entered
NOT - narrows a search by finding records that contain one term but not another
Use AND in a search to:
Use OR in a search to:
Use NOT in a search to: