第六章上机练习

BEGIN TRANSACTION
DECLARE @errorSum INT
SET @errorSum=0
/*--插入数据--*/
INSERT INTO Result(StudentNo,SubjectNo,ExamDate,StudentResult)
VALUES(1,1,GETDATE(),90)
SET @errorSum=@errorSum+@@error
INSERT INTO Result(StudentNo,SubjectNo,ExamDate,StudentResult)
VALUES(1,1,GETDATE(),70)
SET @errorSum=@errorSum+@@error
INSERT INTO Result(StudentNo,SubjectNo,ExamDate,StudentResult)
VALUES(2,1,GETDATE(),67)
SET @errorSum=@errorSum+@@error
INSERT INTO Result(StudentNo,SubjectNo,ExamDate,StudentResult)
VALUES(2,1,GETDATE(),55)
SET @errorSum=@errorSum+@@error
INSERT INTO Result(StudentNo,SubjectNo,ExamDate,StudentResult)
VALUES(3,1,GETDATE(),102)--分数违反约束
SET @errorSum=@errorSum+@@error
INSERT INTO Result(StudentNo,SubjectNo,ExamDate,StudentResult)
VALUES(3,4,GETDATE(),90)
SET @errorSum=@errorSum+@@error
INSERT INTO Result(StudentNo,SubjectNo,ExamDate,StudentResult)
VALUES(4,4,GETDATE(),56)
SET @errorSum=@errorSum+@@error
INSERT INTO Result(StudentNo,SubjectNo,ExamDate,StudentResult)
VALUES(4,4,GETDATE(),88)
SET @errorSum=@errorSum+@@error
INSERT INTO Result(StudentNo,SubjectNo,ExamDate,StudentResult)
VALUES(5,4,GETDATE(),40)
SET @errorSum=@errorSum+@@error
INSERT INTO Result(StudentNo,SubjectNo,ExamDate,StudentResult)
VALUES(5,4,GETDATE(),65)
SET @errorSum=@errorSum+@@error

/*--根据是否有错误，确定事务是提交还是撤销--*/
IF(@errorSum<>0) --如果有错误
BEGIN
PRINT '插入失败，回滚事务'
ROLLBACK TRANSACTION
END
ELSE
BEGIN
PRINT '插入成功，提交事务'
COMMIT TRANSACTION
END
GO
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BEGIN TRANSACTION
DECLARE @errorSum INT
SET @errorSum=0
/*--查询Result表中所有Y2学员的考试成绩，保存到新表HistoreResult*/
SELECT Result.* INTO HistoreResult
FROM Result INNER JOIN Student ON Result.StudentNo=Student.StudentNo
INNER JOIN Grade ON Grade.GradeId=Student.GradeId
WHERE GradeName='Y2'
SET @errorSum=@errorSum+@@error

/*--删除Result表中所有Y2学员的考试成绩*/
DELETE  Result FROM  Result JOIN Student ON Result.StudentNo=Student.StudentNo
INNER JOIN Grade ON Grade.GradeId=Student.GradeId
WHERE GradeName='Y2'
SET @errorSum=@errorSum+@@error

/*--将Student表中所有Y2的学员记录，保存到新表HistoryStudent*/
SELECT Student.* INTO HistoryStudent
FROM Student INNER JOIN Grade ON Grade.GradeId=Student.GradeId
WHERE GradeName='Y2'
SET @errorSum=@errorSum+@@error

/*--删除Studet表中所有Y2学员记录*/
DELETE Student FROM Student
INNER JOIN Grade ON Grade.GradeId=Student.GradeId
WHERE GradeName='Y2'
SET @errorSum=@errorSum+@@error

/*--根据是否有错误，确定事务是提交还是撤销--*/
IF (@errorSum<>0) --如果有错误
BEGIN
PRINT '插入失败，回滚事务'
ROLLBACK TRANSACTION
END
ELSE
BEGIN
PRINT '插入成功，提交事务'
COMMIT TRANSACTION
END
GO

[sql] view plain copy 在CODE上查看代码片派生到我的代码片
CREATE VIEW vw_student_result_info
AS
SELECT 姓名=StudentName,学号=Student.StudentNo,
联系电话=Phone,学期=GradeName,成绩=Total
FROM Student
LEFT OUTER JOIN (
SELECT r.StudentNo,GradeName,SUM(StudentResult) Total
FROM Result r
INNER JOIN (
SELECT StudentNo,SubjectNo,MAX(ExamDate)  ExamDate
FROM Result
GROUP BY StudentNo,SubjectNo) tmp
ON r.ExamDate=tmp.ExamDate
AND r.SubjectNo = tmp.SubjectNo AND r.StudentNo = tmp.StudentNo
INNER JOIN Subject sub ON sub.SubjectNo = r.SubjectNo
INNER JOIN Grade g ON g.GradeId = sub.GradeId
GROUP By r.StudentNo,GradeName ) TmpResult2
ON Student.StudentNo = TmpResult2.StudentNo
GROUP BY StudentName,Student.StudentNo,Phone,GradeName,Total
GO
SELECT * FROM vw_student_result_info

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USE MySchool
GO

IF EXISTS (SELECT name FROM sysindexes
WHERE name = 'IX_Result_StudentResult')
DROP INDEX Result.IX_Result_StudentResult  --删除索引
GO

--考试成绩列上创建可重复索引：填充因子为70％--
CREATE INDEX IX_Result_StudentResult
ON Result(StudentResult)
WITH FILLFACTOR = 70
GO

--查询输出学生姓名、课程名称、考试日期和考试成绩
SELECT StudentName '学生姓名',SubjectName '课程名称',ExamDate '考试日期', StudentResult '考试成绩' FROM Subject,Student,Result
WITH (INDEX = IX_Result_StudentResult)
WHERE StudentResult BETWEEN 80 AND 90 AND Student.StudentNo = Result.StudentNo AND Subject.SubjectId = Result.SubjectId