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Create Derived Column

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Topic

aademeo
Starting Member

5 Posts

Posted - 2014-09-16 : 20:46:19

I'm working on creating a table in SQL where one of the columns is a derived attribute. Need to declare an attribute called CourseDurationYears, which is derived by the total number of years since the CourseStartDate.

Student_Courses
StudentCoursesID
StudentID
CourseID
CourseStartDate
CourseComplete

CourseList
CourseID
CourseDescription
CourseCost
CourseDurationYears
Notes

Below is what I have so far, but I'm stuck on the CourseDurationYears. Not sure what to declare as the datatype or how to correctly have it reflect the derived value:

CREATE TABLE Student_Courses
(
StudentCoursesID INT NOT NULL IDENTITY(1,1),
StudentID INT NOT NULL,
CourseID INT NOT NULL,
CourseStartDate DATETIME NOT NULL,
CourseComplete DATETIME NULL
);

CREATE TABLE CourseList
(
CourseID INT NOT NULL IDENTITY(1,1),
CourseDescription VARCHAR(255) NOT NULL,
CourseCost MONEY NOT NULL,
CourseDurationYears DateTime(YYYY) NOT NULL,
Notes NTEXT NULL
);

khtan
In (Som, Ni, Yak)

17689 Posts

Posted - 2014-09-16 : 20:51:37

Why is the CourseDurationYears in CourseList table is depend on the CourseStartDate of Student_Courses ?

KH
[spoiler]Time is always against us[/spoiler]

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