Boolean search and not9/22/2023 In the example below, searching for sex education NOT abstinence-only will return articles on sex ed, but not those dealing with abstinence-only approaches. Use NOT with caution as good items can be eliminated from the results retrieved. You can use these operators to connector multiple phrases or. when you want to exclude a certain type of article (book reviews, for instance, aren't typically helpful when writing a college-level paper) The dtSearch engine supports Boolean operators, including AND, OR, and NOT.you are interested in a very specific aspect of a topic (letting you weed out the issues that you're not planning to write about).NOT narrows your search by telling the database to eliminate all terms that follow it from your search results. So, if you type in death penalty OR capital punishment, your results will include articles with either term, but not necessarily both. Scenario 3: When you search for Red NOT White, it won’t find a document, because the. Scenario 2: When you search for Red OR White, it will again find the document, because any of the words are present in the document. This is particularly helpful when you are searching for synonyms, such as “death penalty” OR “capital punishment.” Scenario 1: When you search for Red AND White, it will find the document, because both words are present in a document. OR broadens a search by telling the database that any of the words it connects are acceptable. Often, databases will allow you to specify where in the article you want those keywords to appear (title, abstract, full text, etc.). Boolean search allows the combination of five different elements to conduct a search and utilizes a search engine to its fullest potential. All articles in your results will include both keywords. Boolean search is a structured search process that allows the user to insert words or phrases such as AND, OR, NOT to limit, broaden and define the search results. Search for two or more concepts that interest you by combining descriptive keywords with AND.įor instance, if you're interested in reading articles about how young people feel about politics, you can search for youth AND politics. When used in library databases (typed between your keywords) they can make each search more precise - and save you time! See the steps below (or if you prefer, here is a short video).ĪND narrows a search by telling the database that ALL keywords used must be found in an article in order for it to appear in your results list. Now you can create a PowerGREP action for this using the steps above. Then use boolean algebra to put the not outside parentheses so only one not remains: term1 and term3 and not (term2 or term4). In this example from the Web of Science database, you can use the Basic search form to add multiple search lines by clicking on Add Another Field.Boolean operators are the words " AND", " OR" and " NOT". First, put all the negated terms together: term1 and term3 and not term2 and not term4. Sometimes you will have to access the Advanced Search for these options. If youre looking to combine sets and omit other sets, using Ovids Advanced Search tab you can simply type not in the search statement to obtain. Many databases offer the functionality to separate out your search terms, and this saves you having to add the parentheses. The key point in the recruitment/recruiting is to find. OR human as a secondary search - This means that your search results containing human would not be linked in any way to cloning. A Boolean search string is a logical combination of keywords and boolean operators (AND, OR, NOT etc.).If you do not use the parentheses and search using the following:Ĭloning AND sheep OR human, your search will be processed as: If you want to find information on cloning humans and cloning sheep, use the following instruction:Ĭloning AND (sheep OR human) - This will search for cloning AND sheep as well as cloning AND human If you use a combination of AND and OR operators in one search, use parentheses (brackets) to group the OR words together so that your search is processed correctly. They typically recognise AND as the primary operator and will connect concepts with AND together first. Databases usually process the Boolean operators in a logical order.
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