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2. How to learn SQL: These are the best online courses

   www.aol.com/learn-sql-best-online-courses...

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3. Codecademy - Wikipedia

   en.wikipedia.org/wiki/Codecademy

   Codecademy is an American online interactive platform that offers free coding classes in 13 different programming languages including Python, Java, Go, JavaScript, Ruby, SQL, C++, C#, Lua, and Swift, as well as markup languages HTML and CSS.

4. Set operations (SQL) - Wikipedia

   en.wikipedia.org/wiki/Set_operations_(SQL)

   Set operations in SQL is a type of operations which allow the results of multiple queries to be combined into a single result set. [1] Set operators in SQL include UNION, INTERSECT, and EXCEPT, which mathematically correspond to the concepts of union, intersection and set difference.

5. HackerRank - Wikipedia

   en.wikipedia.org/wiki/HackerRank

   HackerRank's programming challenges can be solved in a variety of programming languages (including Java, C++, PHP, Python, SQL, and JavaScript) and span multiple computer science domains. [ 2 ] HackerRank categorizes most of their programming challenges into a number of core computer science domains, [ 3 ] including database management ...

6. Capture the flag (cybersecurity) - Wikipedia

   en.wikipedia.org/wiki/Capture_the_flag_(cyber...

   Capture the Flag (CTF) in computer security is an exercise in which participants attempt to find text strings, called "flags", which are secretly hidden in purposefully-vulnerable programs or websites. They can be used for both competitive or educational purposes.

7. 12 reasons you aren't losing weight even though you're eating ...

   www.aol.com/lifestyle/12-reasons-arent-losing...

   "Practice deep breathing, meditation, yoga, or mindfulness to prevent chronic stress and the overproduction of cortisol," says Costa. If stress becomes overwhelming, seek the support of a ...