I have been seeing this error message since I reinstalled the 1.12 vewrsion from Mediawiki.
Database error A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was: (SQL query hidden) from within function "TitleKey::setBatchKeys". MySQL returned error "1146: Table 'wikidb.PW_titlekey' doesn't exist (localhost)".
Anyone have an idea of what to do about it. The table is indeed NOT in the database as it says, but I can not find references to it anywhere. Thanks!