测试: create table TB_SCORE (id NUMBER not null, tb_student_id NUMBER not null, c_name VARCHAR2(20), grade NUMBER) insert into TB_SCORE (ID, TB_STUDENT_ID, C_NAME, GRADE) values (2, 901, '英语', 80); insert into TB_SCORE (ID, TB_STUDENT_ID, C_NAME, GRADE) values (3, 902, '计算机', 65); insert in...