ER diagram notation in DBMS Theory - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to represent an entity in an ER diagram.

DBMS Theory

An entity is represented by a [1] in an ER diagram.

Drag options to blanks, or click blank then click option'

Arectangle

Bdiamond

Coval

Darrow

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing entities with relationships, which use diamonds.

In ER diagrams, entities are shown as rectangles.

2fill in blank

medium

Complete the code to represent an attribute in an ER diagram.

DBMS Theory

An attribute is represented by a [1] in an ER diagram.

Drag options to blanks, or click blank then click option'

Atriangle

Bdiamond

Crectangle

Doval

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up attributes with entities or relationships.

Attributes are shown as ovals in ER diagrams.

3fill in blank

hard

Fix the error in the description of relationship notation.

DBMS Theory

A relationship is shown by a [1] in an ER diagram.

Drag options to blanks, or click blank then click option'

Aoval

Bdiamond

Crectangle

Dcircle

Attempts:

3 left

💡 Hint

Common Mistakes

Using rectangle or oval instead of diamond for relationships.

Relationships are represented by diamonds in ER diagrams.

4fill in blank

hard

Fill both blanks to describe how primary keys and multivalued attributes are shown.

DBMS Theory

A primary key attribute is shown by an [1] underline, and a multivalued attribute is shown by a [2] oval.

Drag options to blanks, or click blank then click option'

Adouble

Bsingle

Cdashed

Ddouble-lined

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing underline styles or attribute borders.

Primary key attributes are underlined with a single line. Multivalued attributes are shown with double-lined ovals.

5fill in blank

hard

Fill the blanks to complete the description of weak entities and their relationships.

DBMS Theory

A weak entity is represented by a [1], and its identifying relationship is shown by a [2] with a double border.

Drag options to blanks, or click blank then click option'

Arectangle

Bdiamond

Coval

Drectangle with double border

Attempts:

3 left

💡 Hint

Common Mistakes

Using single borders or wrong shapes for weak entities and relationships.

Weak entities are rectangles with double borders. Their identifying relationships are diamonds with double borders.