![]() | ▶ Archives COVID-19 Collection Project | |
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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.
Keywords |
Subject Headings |
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 |
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