Most obvious answer is Java / Oracle Database Tutorial since Oracle is the company who owns Java and that's the tech you'll probably work with if you target this as career.
Java's bigger than Oracle, and the omnipresent fear of license audits seems to be driving more and more people away from the mothership. It doesn't hurt that the entire suite of data access layer options from JDBC on up is designed to work with pluggable drivers for whatever RDBMS you want. I wouldn't count Oracle out, but it's not dominating the Java scene the way I assume Larry Ellison wishes it were.
His question was about finding a tutorial, not about what jdk to use ;)
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