add sql course (#4897)

* add sql course

* add react free course

* Revert "add react free course"

This reverts commit 3607c3b935.

* Update free-courses-vi.md

Co-authored-by: Seth <seth@elypia.org>

Co-authored-by: Seth <seth@elypia.org>
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LeoTino 2020-11-01 03:14:49 +07:00 committed by GitHub
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@ -190,6 +190,7 @@
* [SQL Cơ Bản](https://www.codehub.com.vn/SQL-Co-Ban)
* [SQL Cơ Bản](https://www.youtube.com/watch?v=2fanjSYVElY&list=PL33lvabfss1xnFpWQF6YH11kMTS1HmLsw) - Kteam
* [Học SQL Cơ Bản](https://www.youtube.com/playlist?list=PLE1qPKuGSJaDkQQB5vK7t7-PRIVjtqeHB) - thân triệu
### Swift