Question

我有三个表格。这些设计类似。

学生会

create table student (studID int not null primary key AUTO_INCREMENT,
StudName varchar(20),
Parent varchar(20),
PhoneNo int not null
)

课程表设计

create table Course (CID int not null primary key AUTO_INCREMENT,
CName varchar(20))

stud课程表设计

create table studCourse(studID int not null
,CID int not null
)

如何看待哪些学生的名字和他学习的课程?

Answer 1

你们可以从与日本海洋研究网络的问询中得出一个看法。

CREATE VIEW v AS (
SELECT s.StudName AS student,c.CName AS course  
FROM student s
JOIN studCourse d USING(studID)
JOIN Course c ON (d.CID = c.CID)
)

Answer 2

  CREATE VIEW vwStudent  AS
       SELECT
      s.StudName,
      c.CName
    FROM student s
      INNER JOIN studCourse sc
        ON s.studID = sc.studID
      INNER JOIN Course c
        ON c.CID = sc.CID

或

 CREATE VIEW vwStudent  AS

    SELECT
          s.StudName,
          c.CName
        FROM student s
          JOIN studCourse sc
            ON s.studID = sc.studID
          JOIN Course c
            ON c.CID = sc.CID

引言

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