Follow SQL92 standards. The vendors usually provide a list of non-standard SQL (eg "connect by" in oracle). Just do straight SQL insert, select, update, delete (CRUD) without getting too fancy and you should be fine. The key is to test you app on the various platforms, but to my knowledge DB2...
Three things -- 1) Make sure you specified the .java extension when you typed "javac BigDebt.java", 2) make sure your class declaration is BigDebt and not bigdebt, 3) if you specified a package mke sure you put you .java in a corrisponding directory structure.
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