6、
（1）
/*定义关系模式职员*/
CREATE TABLE Staff
(Sno CHAR(9) PRIMARY KEY,
Sname CHAR(20),
Sage SMALLINT,
SJob CHAR(10),
Sal INT,
Dno CHAR(20)
)
/*定义关系模式部门*/
CREATE TABLE Department
(Dno CHAR(20) PRIMARY KEY,
Dname CHAR(20),
Manager CHAR(20),
Tel CHAR(10)
)
（2）
CREATE TABLE Department
(Dno CHAR(20) PRIMARY KEY,
Dname CHAR(20),
Manager CHAR(20),
Tel CHAR(10)
)
CREATE TABLE Staff
(Sno CHAR(9) PRIMARY KEY,
Sname CHAR(20),
Sage SMALLINT,
SJob CHAR(10),
Sal INT,
Dno CHAR(20),
FOREIGN KEY(Dno) REFERENCES Department(Dno)
)
（3）
CREATE TABLE Department
(Dno CHAR(20) PRIMARY KEY,
Dname CHAR(20),
Manager CHAR(20),
Tel CHAR(10)
)
CREATE TABLE Staff
(Sno CHAR(9) PRIMARY KEY,
Sname CHAR(20),
Sage SMALLINT CHECK(Sage<=60),
SJob CHAR(10),
Sal INT,
Dno CHAR(20),
FOREIGN KEY(Dno) REFERENCES Department(Dno)
)
进行检测：
INSERT INTO Staff(Sno,Sname,Sage,SJob,Sal)
VALUES('20121501','佟陆陆',26,'经理',5000)
SELECT * FROM Staff
INSERT INTO Staff(Sno,Sname,Sage,SJob,Sal)
VALUES('20121502','张三',63,'董事长',10000)
SELECT * FROM Staff
（1）首先根据题目的要求为表添加内容
/*建立新表SCount，记录离散数学成绩的分布*/
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
/*建立存储过程*/
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]'
检测：
EXEC Proc_TRANSFER1/*这句话一定要写！！！*/
SELECT * FROM SCount
（2）
/*建立新表SC_Avg，记录任意一门课的平均成绩*/
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
/*建立存储过程*/
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
/*这行也很重要，没有会报错*/
检测：
EXEC Proc_TRANSFER1
SELECT * FROM SC_Avg
（3）
/*为SC表增加字段NewGrade*/
ALTER TABLE SC ADD NewGrade CHAR(1);
/*建立存储过程*/
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
检测：
EXEC Proc_TRANSFER1
SELECT * FROM SC
心得：
这次作业又写了好久，报错了好多次，最后终于写出来了
