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MediaWiki	    1.18.1
PHP	            5.3.10
PostgreSQL	    8.4.10
Semantic MediaWiki  1.7.0.2

In

  extensions/SemanticMediaWiki/includes/storage/SMW_SQLStore2.php

line 1061, the sought table name

  $smw_tmp_unusedprops = $db->tableName( 'smw_tmp_unusedprops' );

returns a string that is quoted.

That variable is then used in the construction of an SQL statement and prefixed with 'create_'. The SQL statement fails to execute with appropriate errors.

Could be fixed either like this:

  $smw_tmp_unusedprops = trim ( $smw_tmp_unusedprops, "\"'" );

or by having the $db->tableName method doing this for every call, even optionally with a second parameter.