在应使用条件的上下文(在 ',' 附近)中指定了非布尔类型的表达式。
月见寒潭 2015-03-11 09:48:45 SQL语句如下 求解
"select cou_name from course, courseinfo, grade "+
"where grade.cou_id=course.cou_id "+
"and grade.cou_id=courseinfo.cou_id "+
"and grade.stu_id='"+stu_id+"' "+
"and grade.isdual=0 "+
"and (courseinfo.cou_day, courseinfo.cou_time) in "+
"(select cou_day, cou_time from courseinfo where "+
"cou_id='"+cou_id+"')";