For maximum portability, use old fashioned comma join instead of

For maximum portability, use old fashioned comma join instead of
"INNER JOIN ... USING(...)" and "INNER JOIN ... ON ...".

Fix for older MySQL's which don't support the "CASE WHEN ... END"
syntax.  The fix is complicated by the fact that Postgres doesn't
support MySQL's "IF(,,)" syntax.

git-svn-id: svn://svn.code.sf.net/p/phpwiki/code/trunk@655 96ab9672-09ca-45d6-a79d-3d69d39ca109