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Query extensions are used to try to relax the range of full-text search results returned. Consider the following scenario. You want to find out all the notes that refer to anvils. Only one comment contains the word anvils, but you also want to find all the other lines that might be relevant to your search, even if they do not contain anvils. This is also a task for query extensions. When you use the query extension, MySQL scans the data and index two times to complete the search: 1. First, perform a basic full-text search to find all rows that match the search criteria; 2. Second, MySQL examines these matching rows and selects all the useful words (we will briefly explain how MySQL determines what is useful and what is useless). 3. Second, MySQL searches for full text again, this time not only using the original conditions, but also using all the useful words. With query extensions, you can find results that may be relevant, even if they do not accurately contain the word you are looking for. Version query extensions that are only available for MySQL version 4.1.1 or more advanced are introduced in MySQL 4.1.1 and therefore cannot be used in previous versions. Let's take an example and start with a simple

1. mysql Query extension Technology tutorial

Summary: Query extensions are used to try to relax the range of full-text search results returned. Consider the following scenario. You want to find out all the notes that refer to anvils. Only one comment contains the word anvils, but you also want to find all the other lines that might be relevant to your search, even if they do not contain anvils. This is also a task for query extensions. When using the query extension, MySQL scans the data and index two times to complete the search:

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Introduction: Provide Web developers with the most complete PHP development-related Technical tutorial articles to enhance the PHP enthusiasts programming level responsibility

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