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Resources added for Database indexes (#1301)

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      content/roadmaps/101-backend/content/108-more-about-databases/105-database-indexes.md

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# Database indexes
An index is a data structure that you build and assign on top of an existing table that basically looks through your table and tries to analyze and summarize so that it can create shortcuts.
<ResourceGroupTitle>Free Content</ResourceGroupTitle>
<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.freecodecamp.org/news/database-indexing-at-a-glance-bb50809d48bd/'>An in-depth look at Database Indexing</BadgeLink>
<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=-qNSXK7s7_w'>Database Indexing Explained</BadgeLink>

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