Home/ Questions/Q 6589663
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-25T17:12:12+00:00

I am having one situation, i.e. in one table i am having Course, Semester

  • 0

I am having one situation, i.e. in one table i am having Course, Semester and University Columns, in another table i am having Book Number, Author, Booktitle, Publication and Year. For each course, each semester and each university the book differs(i.e., Book Number, Author, Booktitle, Publication), what i am have to do is based on the course, semester and university i have to retrieve the values of Book Number, Author, Booktitle and Publication. i.e. i am doing B.E. Mech, 2nd year means, the retrieving values of Book Number, Author, Booktitle and Publication should be corresponding to B.E. Mechanical, 2nd year books.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    From what I understand, there may be more than one Course / Semester / University combination for one book and probably more than one book per Course / Semester / University? This is a many-to-many relation and can only be solved by a third table:

    CsuToBooks
----------
CsuID
BookID

    When this table is filled, use two ‘LEFT JOIN’ relations in your Queries:

    SELECT Course, Semester, University, BookNumber
FROM csu
LEFT JOIN CsuToBooks ON (csu.ID = CsuToBooks.csuID)
LEFT JOIN Books ON (CsuToBooks.BookID = Books.ID)
    • 0