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CREATE DATABASE student
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DROP DATABASE student
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BACKUP DATABASE student to disk=´c:S4.bak´
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RESTORE DATABASE studnet from DISK = ´c:S4.bak´
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CREATE TABLE Students (
    ID int IDENTITY ( 1, 1), --×ÔÔö×Ö¶Î,»ùÊý1,²½³¤1
    StudentID char (4) NOT NULL ,
    Name char (10) NOT NULL ,
    Age int NULL ,
    Birthday datetime NULL,
    CONSTRAINT PK_Students PRIMARY KEY (StudentID)  --ÉèÖÃÖ÷¼ü
)
CREATE TABLE Subjects (
    ID int IDENTITY ( 1, 1), --×ÔÔö×Ö¶Î,»ùÊý1,²½³¤1
    ClassID char (4) NOT NULL ,
    ClassName char (10) NOT NULL,
    CONSTRAINT PK_Subjects PRIMARY KEY (ClassID)    --ÉèÖÃÖ÷¼ü
)
CREATE TABLE Scores (
    ID int IDENTITY ( 1, 1), --×ÔÔö×Ö¶Î,»ùÊý1,²½³¤1
    StudentID char (4) NOT NULL ,
    ClassID char (4) NOT NULL ,
    Score float NOT NULL,
    CONSTRAINT FK_Scores_Students FOREIGN KEY (StudentID) REFERENCES Students(StudentID), --ÉèÖÃÍâ¼ü
    CONSTRAINT FK_Scores_Subjects FOREIGN KEY (ClassID) REFERENCES Subjects(ClassID), --ÉèÖÃÍâ¼ü
    CONSTRAINT PK_Scores PRIMARY KEY (StudentID,ClassID) --ÉèÖÃÖ÷¼ü
)
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DROP TABLE Students
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CREATE VIEW s_s_s
AS
SELECT Students.Name, Subjects.ClassName, Scores.Score
from Scores INNER JOIN
      Students ON Scores.StudentID = Students.StudentID INNER JOIN
      Subjects ON Scores.ClassID = Subjects.ClassID
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DROP VIEW s_s_s
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CREATE PROCEDURE GetStudent
@age INT,
@birthday DATETIME
AS
SELECT *
from students
WHERE Age = @age AND Birthday = @birthday
GO
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