Swati Kumari

M. Sc. Bioinformatics

1st semester

Roll no. - 22

BOOLEAN SEARCH IN BIOINFORMATICS

CONTENT

What is boolean search

Basic boolean search operators

Some rule for boolean search

Boolean operator : AND

Example using AND

Boolean operator : OR

Example using OR

Boolean operator : NOT

Example using NOT

Basic Boolean Search Operators

AND (&) makes search more specific.

OR (!) brodens the search.

NOT (-) excludes unrelated terms.

Some Rules for Boolean Search

Boolean operator must have written in capital latter.

Any boolean operator must have a term or keyword both before and

after.

If any one of them (term or keyword) is missing it will show error.

The terms entered will be matched exactly because our result is based

on our quiries whatever we entered.

Example using AND

Insulin AND human

•It would return where the search fields

contain both these term or keyword.

•The shaded area represents search result.

•In mathematical term we can say that “insulin

intersection human” are selected.

Boolean Operator : OR

•The boolean search operator OR is the default setting of any search

engine.

•It return the records that contain either of the search term or keyword

that we specify.

•The more terms we connected with OR, the more search result we will

be find.

Example using OR

Insulin OR human

•It would return records where the

search fields contain either or both of

the them.

•The Shaded area represents search

result.

•In mathematical term we can say

that “insulin union human” are

selected.

Boolean Operator : NOT

•The boolean search operator NOT is equal to the “-” symbol.

•It return records that do not contain a search term in the search.

•Use NOT to exclude a term from search and fewer result will be find

Example Using NOT

lnsulin NOT human

•It would return where the search field containing only information on term, and nothing on keyword.

•The shaded area represents search result.

•In mathematical term we can say that “insulin intersection human compliment” are selected.

REFERENCES

lhttp://www.webopedia.com/TERM/B/Boolean_operator.html lClass lecture

THANK YOU