You can debug the EXTBASE-SQL-Querys by inserting the debug-Code into the File
typo3/sysext/extbase/Classes/Persistence/Storage/Typo3DbBackend.php
Search for the Method "buildQuery". That is where the querys are build. Insert your code and see the result.
For Example, add the lines before the return-Statement. Change yourtablename to your table name. This will prevent you from dumping every Query. You just will see the querys for the specified table.
if (in_array("your_table_name", $sql['tables'])) {
var_dump($statement);
print_r($statement);
}
