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SELECT student_no AS '学号',COUNT(*) AS '选修课程数量' FROM choose WHERE student_no = 2012001;
SELECT student.student_name,COUNT(*) FROM choose,student WHERE choose.student_no = student.student_no GROUP BY student.student_no;
SELECT student.student_name,COUNT(*) FROM choose INNER JOIN student ON choose.student_no = student.student_no GROUP BY choose.student_no;
SELECT student.student_name,COUNT(*) AS course_num,MAX(score),MIN(score),SUM(score),AVG(score) FROM choose,student WHERE choose.student_no = student.student_no GROUP BY student.student_no;
SELECT student.student_name,AVG(score) FROM student,choose WHERE choose.student_no = student.student_no GROUP BY student.student_no HAVING AVG(score) < 70;
SELECT class_name,student.student_no,student.student_name,course_name,score FROM course,choose,student,classes WHERE choose.student_no = student.student_no AND choose.course_no = course.course_no AND student.class_no = classes.class_no AND score > (SELECT AVG(score) FROM choose,student WHERE choose.student_no = student.student_no AND student_name = '张三');
SELECT choose.course_no AS '课程编号',course.course_name AS '课程名字',teacher_name AS '老师名字', teacher_contact AS '老师电话',description AS '课程描述' FROM teacher,choose,course WHERE teacher.teacher_no = course.teacher_no AND course.course_no = choose.course_no AND choose.student_no = 2012001;
SELECT classes.department_name AS '院系',class_name AS '班级',student.student_no '学号', student_name AS '姓名',student_contact AS '电话' FROM choose,classes,student WHERE choose.course_no = 1 AND student.student_no = choose.student_no AND student.class_no = classes.class_no ORDER BY classes.department_name;
SELECT classes.department_name AS '院系',class_name AS '班级',student.student_no '学号', student_name AS '姓名',student_contact AS '电话' FROM choose,classes,student WHERE choose.course_no = 1 AND student.student_no = choose.student_no AND student.class_no = classes.class_no ORDER BY classes.class_name;
SELECT classes.department_name AS '院系',class_name AS '班级',student.student_no '学号', student_name AS '姓名',student_contact AS '电话' FROM choose,classes,student WHERE choose.course_no = 1 AND student.student_no = choose.student_no AND student.class_no = classes.class_no ORDER BY student.student_no;
SELECT student_no AS '编号',student_name AS '姓名',student_contact AS '联系方式' FROM student UNION SELECT teacher_no AS '编号',teacher_name AS '姓名',teacher_contact AS '联系方式' FROM teacher;
SELECT * FROM course WHERE get_choose_number_fn(course_no)>= up_limit;
SELECT * FROM course WHERE course_no IN ( SELECT choose.course_no FROM choose,course WHERE choose.course_no = course.course_no GROUP BY course.course_no HAVING COUNT(choose.course_no) >= course.up_limit );
DELIMITER $$ CREATE FUNCTION get_choose_number_fn(course_no1 VARCHAR(10)) RETURNS INT READS SQL DATA BEGIN DECLARE choose_number INT; SELECT COUNT(student_no) INTO choose_number FROM choose WHERE course_no = course_no1; RETURN choose_number; END; $$ DELIMITER ;
SHOW CREATE FUNCTION get_choose_number_fn;
SELECT get_choose_number_fn('1');
DELIMITER $$ CREATE FUNCTION set_student() RETURNS BOOL NO SQL BEGIN DECLARE i INT DEFAULT 1; WHILE i <= 60 DO INSERT INTO student VALUES(2013000+i,CONCAT('机器人',i),NULL,3); INSERT INTO choose VALUES(NULL,2013000+i,1,NULL,NULL); SET i= i + 1; END WHILE; RETURN TRUE; END; $$ DELIMITER ;
DROP FUNCTION set_student;
SELECT set_student();
SELECT * FROM course WHERE get_choose_number_fn(course_no) < 30; SELECT * FROM course WHERE course_no IN (SELECT course_no FROM choose GROUP BY course_no HAVING COUNT(course_no) < 30); SELECT course.course_no FROM course WHERE NOT EXISTS (SELECT DISTINCT choose.course_no FROM choose WHERE choose.course_no = course.course_no); SELECT course.course_no FROM course WHERE course.course_no NOT IN (SELECT choose.course_no FROM choose);
SELECT DISTINCT course.course_no,course_name,teacher_name,up_limit,get_choose_number_fn(course.course_no) AS 'student_num', up_limit - get_choose_number_fn(course.course_no) AS 'available' FROM choose,course,teacher WHERE choose.course_no = course.course_no AND course.teacher_no = teacher.teacher_no;
CREATE VIEW available_course_view AS SELECT DISTINCT course.course_no,course_name,teacher_name,up_limit,get_choose_number_fn(course.course_no) AS 'student_num', up_limit - get_choose_number_fn(course.course_no) AS 'available' FROM choose,course,teacher WHERE choose.course_no = course.course_no AND course.teacher_no = teacher.teacher_no;
SELECT * FROM available_course_view;
DELIMITER $$ CREATE PROCEDURE get_score_proc(IN tmp_student_no VARCHAR(10),IN tmp_course_no VARCHAR(10),OUT tmp_score INT) READS SQL DATA BEGIN SELECT score INTO tmp_score FROM choose WHERE student_no = tmp_student_no AND course_no = tmp_course_no; END $$ DELIMITER ;
DROP PROCEDURE get_score_proc;
SET @tmp_student_no = '2012002'; SET @tem_course_no = '3'; SET @tem_score = 0; CALL get_score_proc(@tmp_student_no,@tem_course_no,@tem_score); SELECT @tem_score;
DELIMITER $$ CREATE PROCEDURE get_course_name_proc(IN tmp_teacher_no VARCHAR(10),OUT tmp_course_name VARCHAR(30)) READS SQL DATA BEGIN SELECT course_name INTO tmp_course_name FROM course WHERE tmp_teacher_no = course.teacher_no; END $$ DELIMITER ;
SET @tmp_teacher_no = '003'; SET @tmp_course_name = '0'; CALL get_course_name_proc(@tmp_teacher_no,@tmp_course_name); SELECT @tmp_course_name;
DROP PROCEDURE choose_proc; DELIMITER $$ CREATE PROCEDURE choose_proc(IN tmp_student_no VARCHAR(10),IN tmp_course_no VARCHAR(10),OUT tmp_status INT) READS SQL DATA BEGIN DECLARE t1 INT; DECLARE t2 VARCHAR(6); DECLARE t3 INT; DECLARE CONTINUE HANDLER FOR 1452 BEGIN SET @error_info = '外键约束'; END;
SELECT COUNT(*) INTO t1 FROM choose WHERE student_no = tmp_student_no AND course_no = tmp_course_no; IF (t1 >= 1) THEN SET tmp_status = -1; ELSE SELECT course.status INTO t2 FROM course WHERE course_no = tmp_course_no; IF (t2 = '未审核') THEN SET tmp_status = -3; ELSE SELECT available INTO t3 FROM available_course_view WHERE course_no = tmp_course_no; IF (t3 <= 0) THEN SET tmp_status = -2; ELSE INSERT INTO choose VALUES(NULL,tmp_student_no,tmp_course_no,NULL,NOW()); SET tmp_status = 0; END IF; END IF; END IF; END $$ DELIMITER ;
SET @state = 1; CALL choose_proc('2012003',1,@state); SELECT @state; SET @state = 0; CALL choose_proc('2012003',2,@state); SELECT @state; SET @state = 0; CALL choose_proc('2012003',3,@state); SELECT @state; SET @state = 0; CALL choose_proc('2012003',4,@state); SELECT @state;
SET @state = 0; SET @error_info = ''; CALL choose_proc('2016003',2,@state); SELECT @state,@error_info;
CREATE DATABASE choose; USE choose;
DROP TABLE choose; DROP TABLE student; DROP TABLE course; DROP TABLE classes; DROP TABLE teacher;
CREATE TABLE teacher( teacher_no VARCHAR(10) PRIMARY KEY, teacher_name VARCHAR(30) NOT NULL, teacher_contact VARCHAR(30) ) ENGINE = INNODB DEFAULT CHARSET=utf8;
CREATE TABLE classes( class_no VARCHAR(10) PRIMARY KEY, class_name VARCHAR(30) NOT NULL UNIQUE, department_name VARCHAR(30) NOT NULL ) ENGINE = INNODB DEFAULT CHARSET=utf8;
CREATE TABLE course( course_no VARCHAR(10) PRIMARY KEY, course_name VARCHAR(30) NOT NULL, up_limit INT DEFAULT 60, description TEXT, STATUS VARCHAR(6) DEFAULT '未审核', teacher_no VARCHAR(10) NOT NULL UNIQUE, CONSTRAINT course_teacher_fk FOREIGN KEY(teacher_no) REFERENCES teacher(teacher_no) )ENGINE = INNODB DEFAULT CHARSET=utf8;
CREATE TABLE student( student_no VARCHAR(10) PRIMARY KEY, student_name VARCHAR(30) NOT NULL, student_contact VARCHAR(30), class_no VARCHAR(10), CONSTRAINT student_class_fk FOREIGN KEY(class_no) REFERENCES classes(class_no) )ENGINE = INNODB DEFAULT CHARSET=utf8;
CREATE TABLE choose( choose_no INT AUTO_INCREMENT PRIMARY KEY, student_no VARCHAR(10) NOT NULL, course_no VARCHAR(10) NOT NULL, score TINYINT UNSIGNED, choose_tim DATETIME, CONSTRAINT choose_student_fk FOREIGN KEY(student_no) REFERENCES student(student_no), CONSTRAINT choose_course_fk FOREIGN KEY(course_no) REFERENCES course(course_no) )ENGINE = INNODB DEFAULT CHARSET=utf8; INSERT INTO teacher VALUES('001','张老师','11000000000'); INSERT INTO teacher VALUES('002','李老师','12000000000'); INSERT INTO teacher VALUES('003','王老师','13000000000');
INSERT INTO classes(class_no,class_name,department_name) VALUES('1','2012自动化1班', '机电工程'); INSERT INTO classes(class_no,class_name,department_name) VALUES('2','2012自动化2班', '机电工程'); INSERT INTO classes(class_no,class_name,department_name) VALUES('3','2012自动化3班', '机电工程');
INSERT INTO course VALUES('1','java语言程序设计',DEFAULT,'暂无','已审核','001'); INSERT INTO course VALUES('2','MySQL数据库',150,'暂无','已审核','002'); INSERT INTO course VALUES('3','c语言程序设计',230,'暂无','已审核','003');
INSERT INTO student VALUES ('2012001','张三','15000000000',1), ('2012002','李四','16000000000',1), ('2012003','王五','17000000000',3), ('2012004','马六','18000000000',2), ('2012005','田七','19000000000',2);
INSERT INTO choose VALUES (NULL,'2012001',2,40,NOW()), (NULL,'2012001',1,50,NOW()), (NULL,'2012002',3,60,NOW()), (NULL,'2012002',2,70,NOW()), (NULL,'2012003',1,80,NOW()), (NULL,'2012004',2,90,NOW()), (NULL,'2012005',3,NULL,NOW()), (NULL,'2012005',1,NULL,NOW());
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