Report:DialogClassic and Classic Web/Search Syntax/Allowed Operators/Boolean and Proximity Operators
|Report||Patent Coverage Map||Ratings||Comments|
|This search system report was created by the Intellogist Team and is available for viewing only. If you'd like to share your knowledge on Intellogist, please visit the Best Practices, Glossary, or Community Reports pages. Registered users may be notified of any substantial changes to this report by placing a "watch" on the Revisions page, which is the last page listed in the table of contents. To learn more about using the Intellogist "watchlist," see the Watchlist Help page.|| |
Boolean and Proximity Operators
The Dialog command line system offers users the basic AND, OR, and NOT Boolean operators as well as a variety of useful proximity and truncation operators.
The following Boolean Operators are available when searching on Dialog:
- OR -- The plus sign (+) may also be used in place of OR
- AND -- The asterisk character may also be used in place of AND
Proximity operators, commonly found in patent search systems, are available on Dialog. Proximity operators allow a searcher to specify within a query that one or more search terms be found within a particular distance to one or more other terms. Following is a list and description of the each of the available proximity operators.
- (W) This operator is used to return terms that are adjacent to each other and in order in which they are entered in the query.
- (N) This operator may be used to return terms that are adjacent but in any order.
- (S) This operator will return terms that are in the same subfield as defined by the database. In full-text files, this operator returns terms that are in the same paragraph.
- (F) This operator returns only terms that are in the same datafield, as defined by the particular database being searched.
- (L) This operator returns only terms that in the same descriptor unit as defined by the database, such as ASTHMA — DIAGNOSIS. This can be thought of as a “heading-subheading” subject descriptor.
- (T) This operator is used when chemical name searching in certain files to return one part of a chemical name with another part.
Also, proximity operators may be combined with the Boolean operator NOT, in the following way:
SELECT ECONOMIC(NOT W)RECOVERY SELECT BULIMIA(NOT L)PATHOLOGY