00:14:42 select studentid, name, achieve.courseid, coursename, coursecredit, coursetime from test.student, test.achieve, test.course where test.student.studentid = test.achieve.studentid and achieve.courseid = course.courseid LIMIT 0, 1000 Error Code: 1052. Column 'studentid' in field list is ambiguous 0.000 sec

这个错误的原因是你在查询语句中使用了多个表，并且这些表有相同的列名，导致数据库无法确定你要查询哪个表的该列。解决这个问题的方法是在查询语句中指定列所属的表，例如：

SELECT test.student.studentid, test.student.name, test.achieve.courseid, test.course.coursename, test.course.coursecredit, test.course.coursetime
FROM test.student, test.achieve, test.course
WHERE test.student.studentid = test.achieve.studentid AND test.achieve.courseid = test.course.courseid
LIMIT 0, 1000;

这样就可以避免列名冲突导致的错误。