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2. 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.

3. Comparison of online source code playgrounds - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_online...

   Playground Access PHP Ruby/Rails Python/Django SQL Other DB Fiddle [am]: Free & Paid No No No Yes MySQL, PostgreSQL, SQLite dbfiddle [an]: Free No No No Yes Db2, Firebird, MariaDB, MySQL, Node.js, Oracle, Postgres, SQL Server, SQLite, YugabyteDB

4. Microsoft Learn - Wikipedia

   en.wikipedia.org/wiki/Microsoft_Learn

   This area contains online training modules and courses organized into three areas: Training Paths, Career Paths, and Student Hub. Modules and courses consist of a series of articles that include exercises and are available in beginner, intermediate, and advanced levels.

5. Exercism - Wikipedia

   en.wikipedia.org/wiki/Exercism

   Exercism is an online, open-source, free coding platform that offers code practice and mentorship [4] on 74 different programming languages. [ 3 ] [ 5 ] History

6. 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 .

7. AOL

   search.aol.com

   The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

8. SQL - Wikipedia

   en.wikipedia.org/wiki/SQL

   SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...

9. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!