比较sql中的列与列

Question

我有两张桌子，＆＃39;学生＆＃39;和老师＆＃39;。＆＃39;学生＆＃39;有两列＆＃39; roll＆＃39;，＆＃39; class＆＃39;。＆＃39;老师＆＃39;还有2列＆＃39; id＆＃39;，＆＃39; class＆＃39;。我想获取一些＆＃39; roll＆＃39;来自学生的专栏＆＃39;表格的某些值为＆＃39; class＆＃39;列将与＆＃39; class＆＃39;的值匹配老师的专栏＆＃39; table.can你能帮我解决一下吗？

**student**              **teacher** 
roll     class           id       class

1         one            101       one
2         three          102       three
3         five           103       four

Answer 1

SELECT Roll FROM Student S. INNER JOIN老师T ON S.Class = T.Class

Answer 2

SELECT
    student.roll
FROM
    student
    INNER JOIN teacher ON student.class = teacher.class