The book I read to research this post was Amazon Relational Database System or RDS Developer Guide which is very good but rather short and I downloaded it for free from kindle. A relational database means it has several tables which are each linked by at least one column which is called a primary field. A primary field means the same column is duplicated in at least 2 tables. You can construct a complex database in this way. RDS is a cloud computing service that works as a back end database. You need either MySQL, SQL Server or Oracle RDBMS on your computer to interact with it. Incidently MySQL is open source and free and there is a version that works with windows. You use SQL to do your queries and there are 4 computer languages you can use for development work including ruby and java. You do have to pay to use this service but it should save you a stack of money you would normally spend on computer hardware.
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