MetaQuestions: better SQL tutorials and Informix documentation

First of all, I'd like to thank everyone for welcoming me to this newsgroup/list, and for all the warm and helpful comments. I'm going to be (nominally) obnoxious and ask two more meta-questions: *I've seen a LOT of free SQL tutorials on the web that deal with SELECT/UPDATE/INSERT, equijoins, ALTER TABLE, primary keys, the concept of uniqueness, etc.... and even one that deals with nested SELECTs. These are all great, but I haven't seen any that deal with constraint checking, foreign keys, procedures, schemas, cursors, etc... Does anyone know of a tutorial that deals with these more complicated concepts and/or actually works you through building a real application, even a small one? *Is it possible to get Informix' documentation in HTML format? I know it's available in PDF format, but this is unwieldy for me (I've tried using "pdf2html@access.adobe.com" to convert it, but it didn't work). Barring that, is it possible to purchase printed documentation from Informix? To briefly answer the questions asked earlier by various folks: *I'm currently using the free version of Informix-SE. It's great to see a free SQL server [sidebar: when I first heard/read about SQL, I thought it wouldn't be hard to implement an SQL server-- but then when I looked around I couldn't find ANY free SQL servers and began to realize how hard it was-- I don't count msql and the like since they specifically admit to not being full-fledged SQL servers (no nested selects for example)-- I began to realize it must be harder than I thought!]. Having a free SQL server is great. Unfortunately, I can't afford to upgrade to anything other than Informix-SE, so I'll need to get my applications to run on it. *I am aware of dbaccess -- in fact, that's the ONLY way I know of to talk to the db server-- are there others (ok, I assume you can write a ESQL/C program that makes library calls to access the db, but are there any other direct ways to access the db server?) Thanks!