Most Databases contain hundreds if not thousands of full text articles. These articles are indexed using metadata (metadata is data about data) When you search using a database, the algorithm is attempting to match your words to the indexed words. The most common fields that will be matched:
Executing a basic search will search across all fields, while an advanced search screen will allow the researcher to select specific fields to search.
For Instance: the researcher will obtain very different results for a search for "Martin Luther" as the author or "Martin Luther" as the subject.
ESBCO Databases: ProQuest Database: