boolean operators and databases

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Boolean Operators & Databases

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Page 1: Boolean operators and databases

Boolean Operators & Databases

Page 2: Boolean operators and databases

Combine using OR/AND/NOT (Boolean Operators)

Boolean logic refers to the logical relationship among search terms (keywords).

Use Boolean Logic to narrow, broaden, or exclude search results. Boolean logic consists of three logical operators: AND/OR/NOT

AND/NOT>>>>>>>>> (Decrease results)OR>>>>>>>>>>>>>> (Increase results)

Use Boolean Logic to connect your keywords in a language databases understand.

Page 3: Boolean operators and databases

Boolean Operators1. Boolean Operator AND>>Connects 2 or more keywords

Example> Fluid AND Electrolyte imbalance

2. Boolean Operator OR>>Connects 2 or more similar concepts

Example> Oral Lesions OR Ulcers

3. Boolean Operator NOT>>Used to exclude words from your search

Example>Women NOT Men

Page 4: Boolean operators and databases

Advanced Search Techniques “Truncation”

What is Truncation?

Truncation, also called stemming, is a technique that allows you to search for various word endings and spellings simultaneously.

Page 5: Boolean operators and databases

Advanced Search Techniques “Truncation”

To use truncation enter the root of a word and put the truncation symbol at the end. The database will return results that include any ending of that root word.

Examples:

child* = child, child’s, children, children’s, childhood

*GOAL in using truncation is to retrieve more results.

Page 6: Boolean operators and databases

Advanced Search Techniques “Truncation”

Truncation symbols may vary by database, the most common truncation symbols are:

* Asterisk

! Exclamation Mark

? Question Mark

# Hashtag

Look at the database “Help” screens to find out which symbol to use.