|AND||limits results and returns terms joined with AND||falls AND long term care|
|OR||expands results, returns either word, use with synonymous terms. best used in conjunction with an AND search||sensory processing AND teenagers OR adolescents|
|NOT||excludes terms from search||dolphins NOT Miami|
While thinking of related terms and concepts is useful in searching, some databases, like CINAHL and MEDLINE, also utilize subject headings. Knowing the difference between them and when to use a keyword vs. a subject heading can have an impact on your search results.
|Looks for word occurrence in multiple locations of results||Only searches the subject headings field of results|
|Is a broader search and will yield more results, not all of them relevant||Is more precise, and yields less, although more relevant results|
|You can "make up" a keyword||Subject headings are chosen from a preexisting list and cannot be altered|