建立學生S、課程C、老師T、學生成績表SC:

相關的sql練習：https://blog.csdn.net/glgom/article/details/82900890

-- 學生資訊表
CREATE TABLE S(
UUID VARCHAR(36) NOT NULL COMMENT '隨機主鍵' PRIMARY KEY,
SID VARCHAR(36) NOT NULL COMMENT '學號，唯一' UNIQUE,
SNAME VARCHAR(30) COMMENT '學生姓名',
AGE INT COMMENT '年齡',
SEX VARCHAR(1) COMMENT '性別'
);
-- UNIQUE唯一約束

INSERT INTO S(UUID,SID,SNAME,AGE,SEX)
VALUES('121','002','盲僧',10,'2'),
('122','003','蓋倫',20,'2'),
('123','005','迦娜',18,'1'),
('124','008','賈克斯',50,'2'),
('125','009','青鋼影',22,'1'),
('126','006','韋魯斯',22,'2'),
('127','011','菲奧娜',20,'1'),
('128','010','諾手',40,'2'),
('129','012','金克絲',17,'1'),
('130','013','洛',19,'2'),
('132','014','霞',19,'1'),
('133','016','趙信',22,'2'),
('134','020','娑娜',15,'1'),
('136','023','亞索',25,'2'),
('140','022','艾希',15,'1')

;
-- 新增單條資料
INSERT INTO S(UUID,SID,SNAME,AGE,SEX) 
value("100","333","郭",25,"1")
;

-- 課程資訊表
CREATE TABLE C(
CID VARCHAR(36) NOT NULL COMMENT '課程號，主鍵' PRIMARY KEY,
CNAME VARCHAR(60) COMMENT '課程名',
TID VARCHAR(36)  COMMENT '教師編號'
);

INSERT INTO C(CID, CNAME, TID)
VALUES('001','資料結構','211'),
('002','語文','212'),
('005','數學','213'),
('010','物理','217'),
('021','化學','215'),
('011','生物','214'),
('033','英語','216')

;

-- 成績表
CREATE TABLE SC(
SID VARCHAR(36) COMMENT '學生學號',
CID VARCHAR(36) COMMENT '課程編號',
SCORE DOUBLE COMMENT '成績'
);

INSERT INTO SC(SID, CID, SCORE)
VALUES('002','001',99),
('002','002',65),
('002','005',84),
('002','010',59),
('002','011',48),
('002','021',87),
('002','033',88),
('003','001',79),
('003','002',78),
('003','005',84),
('003','010',68),
('003','011',84),
('003','021',89),
('003','033',88),
('005','001',68),
('005','002',79),
('005','005',91),
('005','010',65),
('005','011',87),
('005','021',93),
('005','033',77),
('008','002',77),
('008','005',84),
('008','010',84),
('008','011',85),
('009','010',78),
('009','011',95),
('009','021',56),
('009','033',77),
('011','001',78),
('011','002',87),
('011','005',95),
('011','010',68),
('011','011',94),
('011','021',93),
('020','001',59)

;


-- 教師表
CREATE TABLE T(
TID VARCHAR(36) NOT NULL COMMENT '教師編號' PRIMARY KEY,
TNANE VARCHAR(30) COMMENT '教師姓名' 
)
;

INSERT INTO T(TID, TNAME)
VALUES('211','凱爾'),
('212','千鈺'),
('213','克列'),
('214','易'),
('215','拉克絲'),
('216','盧錫安'),
('217','奎因')
;
ALTER table t CHANGE TNANE TNAME VARCHAR(30)