Derived Attribute

Total Participation of $E_2$ in $R$

Cardinality Ratio $1$: $N$ for $E_1$:$E_2$ in $R$

Structural Constraint $($min$,$ max$)$

on Participation of $E$ in $R$i need help with the diagram for this project! Ann is the owner of Huntsville Music School. The lessons offered by the school include piano,

violin, guitar, drum, and voice. Students can come morning, afternoon, and evening. The prices

for the lessons are $

$3$

$0$

$$for

$3$

$0$

$$minutes

$($

entry

$-$

level

$)$

$,$

$$$

$4$

$0$

$$for

$4$

$5$

$$minutes

$($

middle

$-$

level

$)$

$,$

$$and $

$5$

$0$

for

$6$

$0$

$$minutes

$($

advance

$-$

level

$)$

$.$

$$Each lesson will be led by one instructor. Each lesson has at

least one student and no more than six students. Students also will attend competitions and at

least one instructor will go with students. Right now, Anna wants you to help her design a

database to manage the information of instructors, students, lessons, and competitions.

Expect names, addresses, phone numbers, and SSNs

$,$

$$the lessons the instructor prefer to teach,

and the time they want to teach need to be collected. Students

$$

$$information will include name,

age, address, and phone number and if the student is under

$1$

$9$

$,$

$$the parent

$$

s information needs

to be collected. The instructor of each lesson and the registered students need to be stored.

When students attend the competition, the competition information such as date, name, rank,

comments, and instructor name will be recorded.

Design an Entity

$-$

Relationship diagram for the database and enter the design using a software. Symbol

Meaning

Entity

Weak Entity

Relationship

Indentifying Relationship

Attribute

Key Attribute

Multivalued Attribute