mysql在查询中常见问题汇总

Posted 2020-10-24 laoniaofly

1.从主从表中查询外键内容（常见问题）

从主从表中查询对应的外键，需要指定外键的表，即sno=》 student.sno或者score.sno

错误：select sno,sname,degree from student,score where student.sno=score.sno;

正确：select student.sno,sname,degree from student,score where student.sno=score.sno;