delphi7中让edit里显示select count(student-sno) as 大于九十分的人数 from s

简单点可以这样写：select count(student_sno) as 大于九十分的人数 from score where total_score>90select count(student_sno) as 人数 from score 相除就可以了 再问： 代码怎么写？？？adoquery1。SQL。Add('(select cast(((select count(*) from score where course_cno='''+form1。Edit1。Text+''' and total_score >= 90) / (select count(*) from score where course_cno='''+form1。edit1。text+'''))*100 as varchar(10)) as 百分比 from score)');我这样写，运行的时候总是等于0，怎么回事？？