【无标题】修改+删除顶层class

# 最顶层的class信息如何删除 -- 步骤1删除该班级学生关联的成绩先删最底层score表 DELETE FROM score WHERE studentNo IN (SELECT studentNo FROM student0 WHERE classNo210601); -- 步骤2删除该班级的所有学生再删中间层student0表 DELETE FROM student0 WHERE classNo210601; -- 步骤3删除班级本身最后删顶层class0表修正表名 DELETE FROM class0 WHERE classNo210601;# 最顶层的class信息如何删除 -- 步骤1删除该班级学生关联的成绩先删最底层score表 DELETE FROM score WHERE studentNo IN (SELECT studentNo FROM student0 WHERE classNo210601); -- 步骤2删除该班级的所有学生再删中间层student0表 DELETE FROM student0 WHERE classNo210601; -- 步骤3删除班级本身最后删顶层class0表修正表名 DELETE FROM class0 WHERE classNo210601;1查询筛选2匿名操作3去重4语句where5正倒序