You should be asking yourself what your problem is. Clearly, you still haven't read the referenced materials; proprietary extensions are not needed. Here's something else to read while you're at it: SQL Standardization. There is no single "standard SQL." SQL standardization has gone through many iterations: SQL-86, SQL-89, SQL-92, SQL:1999, SQL:2003, SQL:2006, SQL:2008, SQL:2011. The SQL standard is presently maintained by ISO/IEC JTC 1.
So yes, your initial statement (which was "SQL certainly is not turing complete") was and remains provably false, and you're still simply unable to admit your error. Put down the shovel. Do you conduct your professional affairs with the same level of reasoning you're demonstrating here? Incidentally, appealing to the authority of "hundreds of articles" you claim will show you're right doesn't help your cause any, as the majority of such articles will be nothing more than "Bob's Blog" posts and will be equally based on ignorance. Please feel free to keep arguing, though I still recommend taking a break to read the originally referenced materials in their entirety.