Until now, we have been searching by topic or keywords. When a database searches for keywords, it searches the entire full text of its contents.
The solution to this problem is to use the Advanced Search features available in all databases to search specific fields, instead of searching the entire text.
A field search directs the database to search for the words that you have entered, but only with relation to a specific category or "field". For example, Hemingway, Ernest in the author field will only search for works by him, not for anything about him.
Subject headings (sometimes called subject terms or descriptors), are standardized terms that describe and organize items in databases. You can use these terms to find material on the same topic regardless of the words used in the text.
There are a couple of different ways to find subject headings: