SQL (Standard Query Language) is a programming language used for database filtering and editing. It is used in places like hospitals and libraries. Useful links below.
Tutorial with an online practice environment:
https://www.tutorialrepublic.com/sql-tutorial/sql-get-started.php
https://www.tutorialrepublic.com/codelab.php?topic=sql&file=select-all
Step-by-step tutorial with quizzes:
https://www.w3schools.com/sql/default.asp
If you know R programming, you can also pass SQL queries through R:
https://db.rstudio.com/getting-started/database-queries/
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