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- entity-relationship diagram exercises and answers pdf
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\vspace2cm \noindent\rule\textwidth0.5pt \textbfAnswer: \beginfigure[H] \centering \begintikzpicture[node distance=2cm] \node[rectangle, draw] (doctor) DOCTOR; \node[rectangle, draw, below left=2cm and -0.5cm of doctor] (patient) PATIENT; \node[rectangle, draw, below right=2cm and -0.5cm of doctor] (date) DATE; \node[diamond, draw, aspect=2, below=1.5cm of doctor] (treats) TREATS; \draw (doctor) -- (treats); \draw (patient) -- (treats); \draw (date) -- (treats); \node at ($(doctor)!0.5!(treats)$) [left] M; \node at ($(patient)!0.5!(treats)$) [left] M; \node at ($(date)!0.5!(treats)$) [right] M; \endtikzpicture \captionTernary Relationship: TREATS \endfigure \noindent The relationship has cardinality M:M:M. In tables, the composite key is (doctor\_id, patient\_id, date).
\draw (dept) -- (manages) node[midway, above] 1; \draw (emp) -- (manages) node[midway, below] 1; \endtikzpicture \captionCompany ERD \endfigure
\textbfTask: Draw the ERD showing a weak entity (Line Item) and its identifying relationship.
\sectionExercise 6: Supertype/Subtype (Generalization) \textbfScenario: \\ A vehicle rental system tracks vehicles. A vehicle can be either a Car or a Truck. \beginitemize \item All vehicles have: VIN (PK), make, model, year. \item Cars have: number of doors, fuel type. \item Trucks have: cargo capacity (tons), number of axles. \enditemize
% Course Entity \node[rectangle, draw, minimum width=2.5cm, minimum height=1cm, right=of student] (course) COURSE; \node[above=0.2cm of course] \textbfCourse; \node[below=0.1cm of course, align=center] \tiny course\_code (PK)\\ title\\ credits;
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\textbfTask: Draw the ERD. Identify primary keys, entity attributes, and relationship cardinality.
\textbfTask: Draw the ERD including entities, attributes, primary keys, and the many-to-many relationship with its attribute.
Az Data |
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| Estimated Az Buy Box: * | {{ item.az_price_formatted }} Currently we don't have any Az data for this item. |
| Az sales rank: | {{ item.azData.sales_rank }} |
| Az Offers: | {{ item.azData.all_offers_count }} |
| ASIN: | {{ item.asin }} |
Walmart Data |
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| Est. Price | {{ item.azData.wm_price_formatted }} |
| Rating: | {{ item.azData.wm_rating }} |
| Offers: | {{ item.azData.wm_offers }} |
External Links |
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| View on Az View on Walmart Search in Google Search by Image Search by UPC | |
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