martinlanghoff 70dd126e0b MDL-12523 accesslib:cleanup_contexts() - Fix invalid SQL syntax and reserved keywords
cleanup_contexts() was not working on Oracle - mostly due to 2 SQL
syntax problems. So probably marginally working elsewhere.

 - We should not use AS when naming table/subselect aliases - only
   when referring to column aliases in the resultset

 - level is a reserved word - oops! - so back to contextlevel
2007-12-10 21:35:58 +00:00
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