I tried to upgrade from 1.9.0 to 1.9.1 a long time ago. Unfortunatly there were some bugs in 1.9.1 which forced me to go back to 1.9.0. Today I tried to upgrade from 1.9.0 to 1.9.1.1 which failed (internal server error due to existing tables).
I think my mistake was that i didnt restore my database too, so now i already have these tables of 1.9.1, causing an error.
Is there any way to solve that issue? Or is there any way to get my data (or at least parts of it) into a new magento installation? Exporting and importing products, customers, etc using magento functions would be lots of work.
EDIT:
here is the error message (first three lines)
a:5:{i:0;s:1064:"Error in file: "/var/www/vhosts/austrokamin.at/httpdocs/app/code/core/Mage/Core/sql/core_setup/upgrade-1.6.0.5-1.6.0.6.php" - SQLSTATE[42S01]: Base table or view already exists: 1050 Table 'core_email_queue' already exists, query was: CREATE TABLE
core_email_queue
(