另一个菜鸟的问题;如何在这里实现Count() ?

I have this query:

我有这个查询:

SELECT mt.*, fordon.*, boende.*, elektronik.*, business.*, hem_inredning.*, hobby.*
FROM classified mt 
LEFT JOIN fordon ON fordon.classified_id = mt.classified_id 
LEFT JOIN boende ON boende.classified_id = mt.classified_id 
LEFT JOIN elektronik ON elektronik.classified_id = mt.classified_id 
LEFT JOIN business ON business.classified_id = mt.classified_id 
LEFT JOIN hem_inredning ON hem_inredning.classified_id = mt.classified_id 
LEFT JOIN hobby ON hobby.classified_id = mt.classified_id 
ORDER BY modify_date DESC
SELECT mt.*, for