A finished BU 453 Unit 2 entity relationship diagram: relationships named in both directions, cardinality and optionality stated, and each one justified by a business fact. Searches like "bu 453 unit 2 assignment example", "bu453 unit 2 sample" and "bu 453 unit 2 example" land here.
What a finished BU 453 Unit 2 entity relationship diagram looks like
A drawing and a register arrive together, and the register is what gets read closely. The diagram carries the entities from the previous unit under the same names, each with its identifier marked and its attributes attached rather than floating. Every connection between two entities is labeled with a verb phrase, and the register underneath states the same relationship twice, once from each end, so a reader can hear whether it sounds true. Cardinality and optionality are recorded as separate facts, since how many and whether any is required are different questions. A note names the notation in use and stays with it. Where a many-to-many connection appears, the register says whether it will resolve into its own entity later and what facts that entity would hold.
How a BU 453 Unit 2 example is structured
Relationships are written out in words before the lines are drawn, because a sentence that reads falsely will be spotted immediately and a symbol on a diagram will not. Reading each one from both ends is what catches the error everybody makes: a relationship that is obviously one to many in the direction you were thinking about turns out to be many to many from the other side. Cardinality and optionality are kept apart so a required relationship is not confused with a single one. The names carry over from the previous unit unchanged, since a model whose entity names drift between deliverables cannot be assembled at the end of the term. The notation is declared because mixing two conventions on one page makes every reading arguable. Unresolved many-to-many connections are flagged rather than fixed, as the fixing belongs with implementation.
Relationships written as sentences first
Each connection is stated in words before it is drawn, because a false sentence is obvious and a false symbol is not.
Every relationship read from both ends
Stating the same link in each direction is what exposes the pairing that looked simple from one side and was not.
How many and whether required
Cardinality and optionality are recorded as two separate facts, since a relationship can be single without being mandatory.
Entity names carried over unchanged
The diagram reuses the names from the earlier list, because a model whose vocabulary drifts cannot be assembled into one thing later.
One notation, declared on the page
The convention in use is named and held throughout, since two notations mixed on a single drawing make every reading arguable.
Where marks go in BU 453 Unit 2
Diagrams lose credit when the symbols were chosen by habit. Crow's feet placed the way they usually go, rather than from a fact in the scenario, produce a model that is internally neat and wrong about the business. Relationships with no verb phrase leave a reader guessing what the line means. Optionality omitted everywhere makes every participation look required, which the scenario rarely supports. Attributes drawn loose, belonging to no entity, cannot be implemented. Entity names invented fresh here break the thread back to the requirements. Two notations on one page make a marker choose which reading to grade. A many-to-many connection left with no comment about how it will be handled defers a decision the term will force later. Diagrams reverse-engineered from a live company database are that company's design.
Get a BU 453 Unit 2 example written to your instructions
Drop in the Unit 2 brief, the rubric your section uses, the scenario and whatever entity list you produced earlier, plus any diagramming tool BU 453 requires. The custom example states each relationship in words from both ends, separates cardinality from optionality, keeps the earlier names and declares one notation. First one free, returned in 24 to 48 hours.
BU 453 Unit 2 questions, answered
Which notation should the diagram use?
The one your section teaches, and the instructions will say. Crow's foot is common in business courses and chen style appears in others, and both express the same facts differently. What matters is declaring the choice on the page and holding it, because a marker checking cardinality against a symbol from another convention will read your model as saying something you did not mean.
Do many-to-many relationships have to be resolved now?
Usually not in this unit, and flagging one is better than quietly leaving it. A conceptual diagram is allowed to show the relationship as the business describes it, with a register note saying it will need its own entity when the model is implemented and naming the facts that entity would carry. Where the instructions ask for a logical model, resolve it and show both.
My company has a data model. Can I diagram that one?
A schema is a design document, and designs are among the things organizations most reliably treat as their own. Drawing an internal model for a school assignment publishes how the business stores what it knows, including things about customers that were never yours to describe. Model the case in the assignment; if it seems thin next to what you see at work, say so in the assumptions.