At first glance, these pages look like a glitch from the 1990s. There are no fancy graphics, no CSS styling, and usually just a stark white background with blue links. But beneath this minimalist exterior lies one of the most powerful, useful, and controversial features of the web: .
In the context of database management, a is an index that includes all the columns a specific query needs to retrieve. This allows the database engine to return results directly from the index itself, completely skipping the step of fetching data from the main table. How Covering Indexes Work Index of
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