/*
 Navicat Premium Data Transfer

 Source Server         : 127.0.0.1
 Source Server Type    : MySQL
 Source Server Version : 50720
 Source Host           : localhost:3306
 Source Schema         : work

 Target Server Type    : MySQL
 Target Server Version : 50720
 File Encoding         : 65001

 Date: 16/02/2022 16:39:35
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for course
-- ----------------------------
DROP TABLE IF EXISTS `course`;
CREATE TABLE `course`  (
  `cid` int(11) NOT NULL AUTO_INCREMENT COMMENT '課程編號(hào)',
  `cname` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '課程名稱(chēng)',
  `tid` int(11) NULL DEFAULT NULL COMMENT '教師編號(hào)',
  PRIMARY KEY (`cid`) USING BTREE,
  INDEX `tid`(`tid`) USING BTREE,
  CONSTRAINT `course_ibfk_1` FOREIGN KEY (`tid`) REFERENCES `teacher` (`tid`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '課程表' ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of course
-- ----------------------------
INSERT INTO `course` VALUES (1, '語(yǔ)文', 2);
INSERT INTO `course` VALUES (2, '數(shù)學(xué)', 1);
INSERT INTO `course` VALUES (3, '英語(yǔ)', 3);

-- ----------------------------
-- Table structure for sc
-- ----------------------------
DROP TABLE IF EXISTS `sc`;
CREATE TABLE `sc`  (
  `sid` int(11) NOT NULL COMMENT '學(xué)生編號(hào)',
  `cid` int(11) NULL DEFAULT NULL COMMENT '課程編號(hào)',
  `score` int(11) NULL DEFAULT NULL COMMENT '分?jǐn)?shù)'
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '成績(jī)表' ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of sc
-- ----------------------------
INSERT INTO `sc` VALUES (1, 1, 90);
INSERT INTO `sc` VALUES (1, 2, 80);
INSERT INTO `sc` VALUES (1, 3, 90);
INSERT INTO `sc` VALUES (2, 1, 70);
INSERT INTO `sc` VALUES (2, 2, 60);
INSERT INTO `sc` VALUES (2, 3, 80);
INSERT INTO `sc` VALUES (3, 1, 80);
INSERT INTO `sc` VALUES (3, 2, 80);
INSERT INTO `sc` VALUES (3, 3, 80);
INSERT INTO `sc` VALUES (4, 1, 50);
INSERT INTO `sc` VALUES (4, 2, 30);
INSERT INTO `sc` VALUES (4, 3, 20);
INSERT INTO `sc` VALUES (5, 1, 76);
INSERT INTO `sc` VALUES (5, 2, 87);
INSERT INTO `sc` VALUES (6, 1, 31);
INSERT INTO `sc` VALUES (6, 3, 34);
INSERT INTO `sc` VALUES (7, 2, 89);
INSERT INTO `sc` VALUES (7, 3, 98);

-- ----------------------------
-- Table structure for student
-- ----------------------------
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student`  (
  `sid` int(11) NOT NULL AUTO_INCREMENT COMMENT '學(xué)生編號(hào)',
  `sname` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '學(xué)生姓名',
  `sage` date NULL DEFAULT NULL COMMENT '出生年月',
  `ssex` char(4) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '學(xué)生性別',
  PRIMARY KEY (`sid`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 9 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '學(xué)生表' ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of student
-- ----------------------------
INSERT INTO `student` VALUES (1, '趙雷', '1990-01-01', '男');
INSERT INTO `student` VALUES (2, '錢(qián)電', '1990-12-21', '男');
INSERT INTO `student` VALUES (3, '孫風(fēng)', '1990-05-20', '男');
INSERT INTO `student` VALUES (4, '李云', '1990-08-06', '男');
INSERT INTO `student` VALUES (5, '周梅', '1991-12-01', '女');
INSERT INTO `student` VALUES (6, '吳蘭', '1992-03-01', '女');
INSERT INTO `student` VALUES (7, '鄭竹', '1989-07-01', '女');
INSERT INTO `student` VALUES (8, '王菊', '1990-01-20', '女');

-- ----------------------------
-- Table structure for teacher
-- ----------------------------
DROP TABLE IF EXISTS `teacher`;
CREATE TABLE `teacher`  (
  `tid` int(11) NOT NULL AUTO_INCREMENT COMMENT '教師編號(hào)',
  `tname` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '教師姓名',
  PRIMARY KEY (`tid`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '教師表' ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of teacher
-- ----------------------------
INSERT INTO `teacher` VALUES (1, '張三');
INSERT INTO `teacher` VALUES (2, '李四');
INSERT INTO `teacher` VALUES (3, '王五');

SET FOREIGN_KEY_CHECKS = 1;

1、查詢(xún)"01"課程比"02"課程成績(jī)高的學(xué)生的信息及課程分?jǐn)?shù)
select s.sid,s.sname,s.sage,s.ssex,sc1.score,sc2.score from student s,sc sc1,sc sc2 where sc1.cid=1 and sc2.cid=2 and sc1.score>sc2.score and sc1.sid=sc2.sid and s.sid=sc1.sid;

3.查詢(xún)平均成績(jī)大于等于60分的同學(xué)的學(xué)生編號(hào)和學(xué)生姓名和平均成績(jī)
select s.sid,s.sname,avg(sc.score) from student s,sc group by s.sid having avg(sc.score)>=60;

4、查詢(xún)名字中含有"風(fēng)"字的學(xué)生信息
select * from student where sname like ‘%風(fēng)%';

5、查詢(xún)課程名稱(chēng)為"數(shù)學(xué)"，且分?jǐn)?shù)低于60的學(xué)生姓名和分?jǐn)?shù)
select s.sname,score from student s,sc where s.sid=sc.sid and cid=2 and score<60;

6、查詢(xún)所有學(xué)生的課程及分?jǐn)?shù)情況；
select cname,score from sc,course where sc.cid=course.cid;

7、查詢(xún)沒(méi)學(xué)過(guò)"張三"老師授課的同學(xué)的信息
select s.* from student s where s.sid not in(select sc1.sid from sc sc1,course c,teacher t where t.tid=c.tid and sc1.cid=c.cid and t.tname=‘張三');

8.查詢(xún)學(xué)過(guò)"張三"老師授課的同學(xué)的信息
select s.* from student s ,sc sc1,course c,teacher t where s.sid=sc1.sid and sc1.cid=c.cid and c.tid=t.tid and t.tname=‘張三';

9、查詢(xún)學(xué)過(guò)編號(hào)為"01"并且也學(xué)過(guò)編號(hào)為"02"的課程的同學(xué)的信息
student(sid) sc(sid cid tid) sc2(sid cid tid) course(cid tid cname)
select s.* from student s,sc sc1,sc sc2 where s.sid=sc1.sid and sc1.sid=sc2.sid and sc1.cid=1 and sc2.cid=2;

10、查詢(xún)學(xué)過(guò)編號(hào)為"01"但是沒(méi)有學(xué)過(guò)編號(hào)為"02"的課程的同學(xué)的信息
select distinct s.* 
	from student s,sc sc1,sc sc2,sc sc3 
		where s.sid=sc1.sid and sc1.sid=sc2.sid and sc1.cid=1 and sc2.cid!=2;

11、查詢(xún)沒(méi)有學(xué)全所有課程的同學(xué)的信息
select s.* from student s where s.sid not in(select sc1.sid from sc sc1,sc sc2,sc sc3 where sc1.cid=1 and sc2.cid=2 and sc3.cid =3 and sc1.sid=sc2.sid and sc1.sid=sc3.sid) group by s.sid;

12、查詢(xún)至少有一門(mén)課與學(xué)號(hào)為"01"的同學(xué)所學(xué)相同的同學(xué)的信息
select distinct s.* from student s,sc sc1 where s.sid=sc1.sid and sc1.cid in(select cid from sc where sid=1) and s.sid<> 1;

13、查詢(xún)和"01"號(hào)的同學(xué)學(xué)習(xí)的課程完全相同的其他同學(xué)的信息
select s.* from student s where s.sid in(select distinct sc.sid from sc where sid<>1 and sc.cid in(select distinct cid from sc where sid=1)group by sc.sid having count(1)=(select count(1) from sc where s.sid=1));

14、查詢(xún)沒(méi)學(xué)過(guò)"張三"老師講授的任一門(mén)課程的學(xué)生姓名
select s.* from student s where s.sid not in(select sc1.sid from sc sc1,course c,teacher t where sc1.cid=c.cid and c.tid=t.tid and t.tname=‘張三');

15、查詢(xún)出只有兩門(mén)課程的全部學(xué)生的學(xué)號(hào)和姓名
select s.* from student s,sc group by sc.sid having count(sc.sid)=2 and s.sid=sc.sid;

16、查詢(xún)1990年出生的學(xué)生名單(注：Student表中Sage列的類(lèi)型是datetime)
select * from student where sage>=‘1900-01-01' and sage<=‘1900-12-31';
select s.* from student s where s.sage like ‘1900-%';（方法2）

17、查詢(xún)每門(mén)課程的平均成績(jī)，結(jié)果按平均成績(jī)降序排列，平均成績(jī)相同時(shí)，按課程編號(hào)升序排列
select sc.cid,avg(score) from sc group by sc.cid order by avg(score) DESC , sc.cid;

18、查詢(xún)?nèi)魏我婚T(mén)課程成績(jī)?cè)?0分以上的姓名、課程名稱(chēng)和分?jǐn)?shù)；
select s.sname,c.cname,score from student s,sc,course c where s.sid=sc.sid and sc.cid=c.cid and score>70;

19、查詢(xún)平均成績(jī)大于等于85的所有學(xué)生的學(xué)號(hào)、姓名和平均成績(jī)
select s.sname,avg(score) from sc,student s where s.sid=sc.sid group by sc.sid having avg(score)>=85;

20、查詢(xún)不及格的課程
select s.sname,c.cname,score from student s,sc,course c where s.sid=sc.sid and sc.cid=c.cid and score<60;

21、查詢(xún)課程編號(hào)為01且課程成績(jī)?cè)?0分以上的學(xué)生的學(xué)號(hào)和姓名；
select s.sid,s.sname from student s,sc where sc.sid=s.sid and sc.cid=1 and score>80;

22、求每門(mén)課程的學(xué)生人數(shù)
select cid,count(sid) from sc group by sc.cid;

23、統(tǒng)計(jì)每門(mén)課程的學(xué)生選修人數(shù)（超過(guò)5人的課程才統(tǒng)計(jì)）。要求輸出課程號(hào)和選修人數(shù)，查詢(xún)結(jié)果按人數(shù)降序排列，若人數(shù)相同，按課程號(hào)升序排列
select cid,count(sid) from sc group by cid having count(sid)>5 order by count(sid),cid ASC;

24、查詢(xún)不同課程成績(jī)相同的學(xué)生的學(xué)生編號(hào)、課程編號(hào)、學(xué)生成績(jī)
select s1.sid,s2.sid,sc1.cid,sc1.score,sc2.score from student s1,student s2,sc sc1,sc sc2 where s1.sid!=s2.sid and s1.sid=sc1.sid and s2.sid=sc2.sid and sc1.cid!=sc2.cid and sc1.score=sc2.score;

25、檢索至少選修兩門(mén)課程的學(xué)生學(xué)號(hào)
select sid from sc group by sid having count(cid)>=2;

26、查詢(xún)選修了全部課程的學(xué)生信息
select s.* from sc,student s where s.sid=sc.sid group by sid having count
(cid)=3;

27、查詢(xún)各學(xué)生的年齡
select s.sname,(TO_DAYS(‘2017-09-07')-TO_DAYS(s.sage))/365 as age from student s;

28、查詢(xún)本月過(guò)生日的學(xué)生
select s.sname from student s where s.sage like ‘_____07%';

29、查詢(xún)下月過(guò)生日的學(xué)生
select s.sname from student s where s.sage like ‘_____08%';

30、查詢(xún)學(xué)全所有課程的同學(xué)的信息
select s.* from student s,sc sc1,sc sc2,sc sc3 where sc1.cid=1 and sc2.cid=2 and sc3.cid=3 and sc1.sid=sc2.sid and sc1.sid=sc3.cid and s.sid =sc1.sid group by s.sid;