语句未结束的错误

sql = "select * from 成绩单 where username='" & username & "' And no=" & no & " And password='" & password & "'"

少了个&符号还有变量和&之间要有空格。

select * ;
from 成绩单;
where username="&username&" And no="&no&" And password="&password"