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Computers and Technology, 12.03.2021 16:10, KhaRNate
We cover primary and foreign key for entities. Each entity in a DB environment should a primary key (PK). A PK attribute cannot be null. However, a foreign key (FK) is optional and is not mandated in all scenarios.
In this activity, you need to narrate three database environments (book store, tax office, movie database, etc.) with two entities and show the entities of DB with the PK and FK. Out of three scenarios
- At least one should involve 2-attribute PK,
- At least one should have only 1-attribute PK
- At least one should have PK-FK relationships.
Each attributes should have at least three attributes. See attached file my examples scenarios. Report your scenarios in a one-page PDF file and submit to D2L.
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Computers and Technology, 22.06.2019 20:10, ianmartin6080
Assume that minutes is an int variable whose value is 0 or positive. write an expression whose value is "undercooked" or "soft-boiled" or "medium-boiled" or "hard-boiled" or "overcooked" based on the value of minutes. in particular: if the value of minutes is less than 2 the expression's value is "undercooked"; 2-4 would be a "soft-boiled", 5-7 would be "medium-boiled", 8-11 would be "hard-boiled" and 12 or more would be a "overcooked".
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We cover primary and foreign key for entities. Each entity in a DB environment should a primary key...
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