wpdb query on custom table not working [closed]

Try putting the table name inside quotes, like this

SELECT * FROM `sparte-bogensport`

Edit

More info on why this happens:
http://dev.mysql.com/doc/refman/5.7/en/identifiers.html

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)