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What is wrong with the following ERD meant to show a
relationship between two entities?
Employee § Dept
There is nothing wrong with the
O ERD.
Both of the objects are attributes.
There is no relationship between
O the entities.
, One of the items is set up as an
o (o] attribute.
RATIONALE
Rectangles are used to indicate the entities. Attributes have ovals
to distinguish them. To show a relationship between entities and
attributes, a line is drawn between them.
CONCEPT
— Tables as Entities
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2 @
Review the sample movie ratings ERD after 3NF.
, User ZipCode
| PK Userld
UserFirstName
UserLastName
Phone
Email MovieGenre
Address Movield
UserName Genreld
Password
Genre
Zip
$x Genreld
GenreName
ex Ratingld
| CE RoleType
$c Movield
K
RoleTypeld
NumericRating RoleTypeName
TextualRating
ReviewDate
Movield
RoleTypeld po——
Personld po—
18 Movield
RoleName
MovieTitle
ReleaseDate
| 8 Personld
Length
PersonFirstName
Description
PersonLastName
AverageRating
What is the relationship between tables Movie and Genre?
M:N