第五章： 数据库完整性 习题 + 存储过程

CREATE TABLE  DEPT
(Deptno NUMBER(2),
Deptname VARCHAR(10),
Manager VARCHAR(10),
PhoneNumber Char(12)
CONSTRAINT PK_SC PIMARY KEY(Deptno));

CREATE TABLE EMP
(Empno NUMBER(4),
ENAME VARCHAR(10),
Age NUMBER(2),
CONSTARINT C1 CHECK(Aage<=60),
Job VARCHAR(9),
Sal NUMBER(7,2),
Deptno NUMBER(2),
CONSTRAINT FK_DEPTNO
FOREIGN KEY(Deptno)
REFERENCES DEPT(Deptno));

（1）
建表过程：

DROP TABLE IF EXISTS SCount;
CREATE TABLE SCount
(
Score CHAR(20),
Num INT 
)
INSERT INTO SCount VALUES('[0,60)',0)
INSERT INTO SCount VALUES('[60,70)',0)
INSERT INTO SCount VALUES('[70,80)',0)
INSERT INTO SCount VALUES('[80,90)',0)
INSERT INTO SCount VALUES('[90,100]',0)
SELECT * FROM SCount

建立存储：

IF(exists(select * from sys.objects where name='Proc_TRANSFER1'))
	DROP PROCEDURE Proc_TRANSFER1
GO
CREATE PROCEDURE Proc_TRANSFER1
AS
BEGIN TRANSACTION TRANS
	DECLARE /*定义变量*/
	@less60 INT,
	@l70m60 INT,
	@l80m70 INT,
	@l90m80 INT,
	@m90    INT,
	@CNO CHAR(4);
	SELECT @CNO =Cno FROM Course WHERE Cname='离散数学'

	/*小于60*/
	SELECT @less60=COUNT (*)
	FROM SC
	WHERE Grade<60 AND Cno=@CNO
	UPDATE SCount SET Num=@less60 WHERE Score='[0,60)'

	/*大于等于60小于70*/
	SELECT @l70m60=COUNT (*)
	FROM SC
	WHERE Grade<70 AND Grade>=60 AND Cno=@CNO
	UPDATE SCount SET Num=@l70m60 WHERE Score='[60,70)'

	/*大于等于70小于80*/
	SELECT @l80m70=COUNT (*)
	FROM SC
	WHERE Grade<80 AND Grade>=70 AND Cno=@CNO
	UPDATE SCount SET Num=@l80m70 WHERE Score='[70,80)'

	/*大于等于80小于90*/
	SELECT @l90m80=COUNT (*)
	FROM SC
	WHERE Grade<90 AND Grade>=80  AND Cno=@CNO
	UPDATE SCount SET Num=@l90m80 WHERE Score='[80,90)'

	/*大于等90*/
	SELECT @m90=COUNT (*)
	FROM SC
	WHERE Grade>=90 AND Cno=@CNO
	UPDATE SCount SET Num=@m90 WHERE Score='[90,100]'

（2）
建表：

DROP TABLE IF EXISTS SC_Avg;
CREATE TABLE SC_Avg
(
Cno CHAR(4),
Cname CHAR(10),
Avg_Score FLOAT 
)
INSERT INTO SC_Avg VALUES('1','高等数学',0)
INSERT INTO SC_Avg VALUES('2','计算机基础',0)
INSERT INTO SC_Avg VALUES('3','离散数学',0)
SELECT * FROM SC_Avg

建立存储：

IF(exists(select * from sys.objects where name='Proc_TRANSFER1'))
	DROP PROCEDURE Proc_TRANSFER1
GO
CREATE PROCEDURE Proc_TRANSFER1
AS
BEGIN TRANSACTION TRANS
	DECLARE /*定义变量*/
	@Avg1 FLOAT,
	@Avg2 FLOAT,
	@Avg3 FLOAT;
	
	SELECT @Avg1=AVG(Grade)
	FROM SC
	WHERE Cno ='1'
	UPDATE SC_Avg SET Avg_Score=@Avg1 WHERE Cno ='1'

	SELECT @Avg2=AVG(Grade)
	FROM SC
	WHERE Cno ='2'
	UPDATE SC_Avg SET Avg_Score=@Avg2 WHERE Cno ='2'

	SELECT @Avg3=AVG(Grade)
	FROM SC
	WHERE Cno ='3'
	UPDATE SC_Avg SET Avg_Score=@Avg3 WHERE Cno ='3'
	COMMIT TRANSACTION TRANS

（3）

ALTER TABLE SC ADD NewGrade CHAR(1);

IF(exists(select * from sys.objects where name='Proc_TRANSFER1'))
	DROP PROCEDURE Proc_TRANSFER1
GO
CREATE PROCEDURE Proc_TRANSFER1
AS
BEGIN TRANSACTION TRANS
	
	UPDATE SC SET NewGrade='D' WHERE Grade<60;
	UPDATE SC SET NewGrade='C' WHERE Grade>=60 AND Grade<75;
	UPDATE SC SET NewGrade='B' WHERE Grade>=75 AND Grade<85;
	UPDATE SC SET NewGrade='A' WHERE Grade>=85;
	ALTER TABLE SC DROP COLUMN Grade
	/*删除字段Grade*/
	COMMIT TRANSACTION TRANS

我觉得第二题有点。。。。。难，时间仓促，还没来得及实验，实验结果正确，我会把截图补上。