Complex Boolean Search
- Enter your search in command language, indicating field qualifiers
in square brackets [].
- Syntax:
term[field] BOOLEAN term[field] BOOLEAN term[field] etc.
- Boolean operators (AND, OR, NOT) must be written
in UPPER CASE
- Boolean operators are processed from left to right unless parentheses
are used for nesting. If parentheses are used, the portions of the query
in parentheses will be processed first, then the remaining Boolean operators will
be processed from left to right.
- list of Search Fields and
Qualifiers
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I'd like to retrieve human nucleotide sequences associated with
colon cancer.
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Demo:
- open Entrez CoreNucleotide search page
- enter the following query into the text box:
colon cancer[titl] AND human[orgn]
Questions:
- How many hits compared to Advanced search?
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