I am often asked variations of the question "which programming language should I learn?" I often refer to lists like the TIOBE index which ranks programming language by usage. However, their definition excludes SQL, and SQL is a very useful skill. Don't get me wrong, I love PL/SQL and have been a PL/SQL programmer myself for 20 years. But PL/SQL is only used in the Oracle database, while SQL is the lingua franca for data analysis. At codeacademy.com , they want to teach everyone to program. They have thought carefully about what you need to know, and out of their 11 web programming lessons, there is One Java One AngularJS Two Ruby Three SQL If you want to build a career in IT, you need to know SQL.
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