Skip to main content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.

Databases : Databases

Electronic databases by title available to CMCC students, faculty, and staff.

Databases A-Z

Boolean Operators


Use AND to narrow a search and retrieve records containing all of the words it separates, e.g. adolescents AND children will only find records containing both these words.



Use OR to broaden a search and retrieve records containing any of the words it separates, e.g. adolescents OR children will find records containing adolescents only, children only, or both words. 


Use NOT to narrow a search and retrieve records that do not contain the term following it, e.g. adolescents NOT children will find records that contain adolescents, but will not contain the word children.

Truncation, Wildcard, and Hyphen Characters


The asterisk (*) is the Truncation character, used to replace one or more characters. The truncation character can be used at the beginning (left-hand truncation), the end (right-hand truncation), or in the middle of a word.

Example: Searching for econom* will find economy, economics, economical, etc.
Searching for *old will find told, household, bold, etc.


The question mark symbol (?) is the Wildcard character, used to replace any single character, either inside or at the right end of the word.
The wildcard character cannot be used to begin a word.

Example: Searching for t?re will find tire, tyre, tore, etc.
Searching for ad??? will find added, adult, adopt


Use a hyphen to indicate a range when searching numerical fields, such as Publication date.

Example: YR(2005-2008)

Central Maine Community College Library - 1250 Turner St., Auburn, Maine 04210 - Telephone: (207)755-5218 - Fax: (207)755-5494
Central Maine Community College is an equal opportunity/affirmative action institution and employer.
For more information, please call (207) 755-5100. [ Full Non-Discrimination Notice]