sql查询测试数据

CREATE TABLE J_TEACHER (
    tno int NOT NULL PRIMARY KEY,
    tname varchar(20) NOT NULL
);

INSERT INTO J_TEACHER(tno,tname)VALUES(1,'张老师');
INSERT INTO J_TEACHER(tno,tname)VALUES(2,'王老师');
INSERT INTO J_TEACHER(tno,tname)VALUES(3,'李老师');
INSERT INTO J_TEACHER(tno,tname)VALUES(4,'赵老师');
INSERT INTO J_TEACHER(tno,tname)VALUES(5,'刘老师');
INSERT INTO J_TEACHER(tno,tname)VALUES(6,'向老师');
INSERT INTO J_TEACHER(tno,tname)VALUES(7,'李文静');
INSERT INTO J_TEACHER(tno,tname)VALUES(8,'叶平');

CREATE TABLE J_STUDENT(
    sno int NOT NULL PRIMARY KEY,
    sname varchar(20) NOT NULL,
    sage datetime NOT NULL,
    ssex char(2) NOT NULL
);

INSERT INTO J_STUDENT(sno,sname,sage,ssex) VALUES(1,'张三','1980-1-23','男');
INSERT INTO J_STUDENT(sno,sname,sage,ssex) VALUES(2,'李四','1982-12-12','男');
INSERT INTO J_STUDENT(sno,sname,sage,ssex) VALUES(3,'张飒','1981-9-9','男');
INSERT INTO J_STUDENT(sno,sname,sage,ssex) VALUES(4,'莉莉','1983-3-23','女');
INSERT INTO J_STUDENT(sno,sname,sage,ssex) VALUES(5,'王弼','1982-6-21','男');
INSERT INTO J_STUDENT(sno,sname,sage,ssex) VALUES(6,'王丽','1984-10-10','女');
INSERT INTO J_STUDENT(sno,sname,sage,ssex) VALUES(7,'刘香','1980-12-22','女');

CREATE TABLE J_COURSE(