这个有什么不同啊，有人可以告诉我吗？THANK YOU VERY MUCH！！！！ 这三个语句有什么不同啊？？？ exec="delete * from wenzhang where name="&trim(request("name"))

exec="delete * from wenzhang where name='"&trim(request("name"))'"

exec="delete * from wenzhang where name=' " &trim(request("name"))' " "

帮我区别一下？