What is Reddit's opinion of OCA Oracle Database 11g SQL Fundamentals I Exam Guide: Exam 1Z0-051 (Oracle Press)?

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Oracle is the most widely used platform and would be best to learn SQL for. Basically, you want to learn ANSI SQL, the SQL statements which are industry standard. Then each distribution (MS SQL, Oracle, MySQL, etc) all have their own extra functions which go beyond the ANSI standard.

This is a good resource

If you want to learn SQL, the best resouce I've found is the Oracle OCA Exam Prep book for the SQL Fundamentals exam.

http://www.amazon.com/Oracle-Database-Fundamentals-Exam-Guide/dp/0071597867/ref=sr_1_1?s=books&ie=UTF8&qid=1424637927&sr=1-1&keywords=oracle+sql+fundamentals

http://smile.amazon.com/Oracle-Database-Fundamentals-Exam-Guide/dp/0071597867/ref=sr_1_1?s=books&ie=UTF8&qid=1454534464&sr=1-1

Learning SQL would be the best place to start.