varchar转int

									select
									 top 7
									 t1.pid as pid
									,sum(cast(t1.buy_num  as int)) as buy_num
									,t2.name as name
									,t2.price as price
									,t2.small_pic_url as small_pic_url
									from t_order_details t1,tb_shang_pin t2
									where t1.pid=t2.id and t2.flag=1 and t2.status=4
									group by t1.pid,t2.name,t2.price,t2.small_pic_url
									order by buy_num desc

 

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