A list containing four data frames reflecting library management database.
Format
A list of four data frames:
books - books on store
isbnbook ISBN number
titlebook title
genrecomma separated book genre
publishername of book publisher
authorname of book author
copiestotal number of book copies on store
borrowers - registered library members
idmember unique id
registereddate the member joined library
addressmember address
namefull member name
phone_numbermember phone number
programmembership program type (standard, premium or vip)
issues - borrowed books events
idunique event id
borrower_idid of the member that borrowed the book
isbnis of the borrowed book
datedate of borrow event
returns - returned books events
idevent id equal to borrow issue id
datedate of return event