{"id":783,"date":"2018-04-02T18:44:05","date_gmt":"2018-04-02T18:44:05","guid":{"rendered":"https:\/\/pressbooks.library.ryerson.ca\/writehere\/?post_type=chapter&p=783"},"modified":"2018-05-25T18:21:15","modified_gmt":"2018-05-25T18:21:15","slug":"not-operator","status":"publish","type":"chapter","link":"https:\/\/pressbooks.library.torontomu.ca\/writehere\/chapter\/not-operator\/","title":{"raw":"NOT Operator","rendered":"NOT Operator"},"content":{"raw":"The operator NOT is used when you want to search for the first term and to exclude items that contain the second term. Teaching is a very broad term that is often qualified by broad levels such as primary, elementary, intermediate, secondary, higher, or, post-secondary. While you may want to specify a level that you want to look for by trying a search such as teaching AND secondary<\/em>, you could decide to qualify or narrow the search by excluding a level that you are not interested in by using the NOT<\/em> operator. The following Venn diagram illustrates the concept teaching<\/em> as shown by the circle in green on the left. The concept post-secondary<\/em> is shown by the light grey-coloured circle on the right.. While there is some overlap with both concepts shared by some articles and books, when you use the NOT<\/em> operator in the example of teaching NOT post-secondary,<\/strong><\/em> you exclude those hits that had both teaching AND post-secondary<\/em> (not shown). That is why the desired set on teaching resembles a circle with a piece removed. [Remember that the NOT<\/em> operator is sometimes called ANDNOT.<\/em> The Help information in a database will give you directions if you can simply use NOT<\/em> or have to use ANDNOT<\/em> as your Boolean operator.]\r\n\r\nExample of a Venn diagram using the NOT operator: teaching NOT post-secondary<\/strong>\r\n\r\n\"\"","rendered":"

The operator NOT is used when you want to search for the first term and to exclude items that contain the second term. Teaching is a very broad term that is often qualified by broad levels such as primary, elementary, intermediate, secondary, higher, or, post-secondary. While you may want to specify a level that you want to look for by trying a search such as teaching AND secondary<\/em>, you could decide to qualify or narrow the search by excluding a level that you are not interested in by using the NOT<\/em> operator. The following Venn diagram illustrates the concept teaching<\/em> as shown by the circle in green on the left. The concept post-secondary<\/em> is shown by the light grey-coloured circle on the right.. While there is some overlap with both concepts shared by some articles and books, when you use the NOT<\/em> operator in the example of teaching NOT post-secondary,<\/strong><\/em> you exclude those hits that had both teaching AND post-secondary<\/em> (not shown). That is why the desired set on teaching resembles a circle with a piece removed. [Remember that the NOT<\/em> operator is sometimes called ANDNOT.<\/em> The Help information in a database will give you directions if you can simply use NOT<\/em> or have to use ANDNOT<\/em> as your Boolean operator.]<\/p>\n

Example of a Venn diagram using the NOT operator: teaching NOT post-secondary<\/strong><\/p>\n

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