order does matter
introduced the DENO
dont check the standard_conforming_strings, because it is on since 2010 and the older versions are not supoorted anymore.
made the comment simpler
bad math
not sure; to be verify
keep only the necessary comments
cleaner var names
updated the link
keep only the necessary comments, and refactored
fixed bad copy-paste
improved the comment
finished test_identifier's MySQL section