Question

i’ll just get straight to the point. my database is like this

every book is stored at reading_materials and every book has its own unique Accession No no matter how many copies it has (disregard the field name ‘Copies’). when a student or personnel borrows a book, the data is inserted at the borrow table. my problem now is, how can i get the most borrowed books on the borrow table.

can someone help me pls?

my database is like this:

borrow

Trans_ID PRIMARY KEY
A_Accession_No FOREIGN KEY references reading_materials(Accession_No)
B_Student_No
DateBorrowed
DateReturned
Penalty

reading_materials

Accession_No PRIMARY KEY
Date_acquired
Title
Copyright
Available

book_author

B_Accesion_No FOREIGN KEY references reading_materials('Accession_No')
Author_ID FOREIGN KEY references author(Author_ID)

author

Author_ID PRIMARY KEY
Name

*i apologize for my bad english and if some of u won’t find this not very clear

Answer 1

try this:

SELECT a.Accession_No, a.Title, COUNT(b.a_accession_NO) as NoOfTimesBorrowed
FROM Reading_Materials a LEFT JOIN borrow b ON a.accession_No = b.a_accession_NO
GROUP BY a.Accession_No
ORDER BY NoOfTimesBorrowed DESC
LIMIT 5

this will select the TOP 5 and sorted from the most borrowed book.