select-mysql語句查詢時間過長如何優化?

mysql語句查詢時間過長如何優化?

SELECT t1.id, t1.order_no, t1.order_status, t1.pay_status,t1.shipping_status,
t1.pay_method, t1.invoice, t1.remark, t1.seller, t1.buyer, t1.site_id, t1.order_time, t1.pay_time,
t1.sign_for_time, t1.delivery_time, t1.subtotal, t1.freight, t1.invitation, t1.cope, t1.is_comment,t1.pay_discount FROM zcwl_order t1 LEFT JOIN
zcwl_order_shipping_address t2 ON t2.order_id = t1.id
WHERE t1.site_id ORDER BY t1.order_time DESC

這條sql語句需要查14秒 如何縮短時間?
ps:大概有1W條數據

最佳回答：

ORDER BY t1.order_time DESC 加上倒序後查詢會很慢 寫在裡面就可以了