M$3$: Identify relationships and determine modality and cardinality of each relationship

M$3$: Draw ER$-$Diagrams

Case $1.$ ThisJazz

ThisJazz is a rental business that rents musical instruments to bands. Create the ER diagram for the ThisJazz Operations Database, based on the following

requirements.

The ThisJazz Operations Database will keep track of instruments, bands, repair technicians, and shows.

For each instrument, ThisJazz will keep track of a unique instrument serial number as well as the instrument model and brand, category, the year when the instrument was made, and

the age $($measured in years$)$ of the instrument.

The customers of ThisJazz are bands. For each band, ThisJazz will keep track of the unique band name and unique band identifier as well as the band's address, contact person's

name, and multiple email addresses.

Repair technicians maintain the instruments. For each technician, ThisJazz will keep track of a unique ID number as well as a name, address, and multiple email addresses.

ThisJazz will record information about shows that its customer bands perform in$.$ For each show, it will keep track of a unique show identifier composed of the show venue name and

date. For each show, it will also keep track of show type and show name $($a show may or may not have a name$),$ and the show theme.

A band does not have to rent any instruments, but may rent up to $10.$ Each instrument may be rented by one band or by no bands at all.

A repair technician maintains one or many instruments. Each instrument is maintained by one technician.

A band may perform in many shows, but must perform in at least one. Each show must have at least one band performing, but may have many bands performing. For each instance

of a band performing in a show, we keep track of the place in the order of performances and the duration $($in minutes$)$ of that band's performance in that show.

For each band, ThisJazz keeps track of the number of shows that the band performs in$.$

For each show, ThisJazz keeps track of the number of bands that participated in the show.