set conn = server.CreateObject("adodb.connection")
conn.Open application("dsn")
sql = "select a.markid,a.imgname,a.settime,a.bookid,b.name,b.Author,b.times,a.detail from bookmark a,BookDetail b where a.bookid = b.bookid and a.username = '" & session("username") & "'"
以上代码select 语句中 a.markid是什么意思? 为什么前面加上了a. 或b.? 它表示的是什么?