Update free-courses-en.md (#4717)

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 ### SQL

+* [Introduction to Database Queries](https://www.edx.org/course/introduction-to-database-queries) - (edX New York University) - (Aspen Olmsted)
 * [SQL Tutorial](https://www.youtube.com/playlist?list=PL_RGaFnxSHWr_6xTfF2FrIw-NAOo3iWMy)
 * [SQL Tutorial - Full Database Course for Beginners](https://www.youtube.com/watch?v=HXV3zeQKqGY) - (Mike Dane) - (freeCodeCamp)