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Crossword Puzzle for Lecture 3 & 4
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Attribute: Property of an object
Primary key: Another name for identifier
Multivalued: The name of an attribute that stores many values.
Multiplicity: Number of instances of one class that may relate to a single instance of another class.
Generalization: “Is-a” relationship between a Superclass (Parent) and Subclasses (Child)
Tuple: A row of record in a table.
Alternate Key: Candidate keys that are not chosen to perform identification tasks.
Degree: Number of attributes it contains.
Cardinality: Number of tuples it contains.
Referential: Integrity rule that states if a foreign key exists in a relation, either the foreign key value must match a candidate key value of some tuple in its home relation or the foreign key value must be wholly null.
Crossword Puzzle for Lecture 3 & 4
Across:3. | A row of record in a table. | 5. | The name of an attribute that stores many values. | 6. | Number of tuples it contains. | 8. | Number of attributes it contains. | 9. | Integrity rule that states if a foreign key exists in a relation, either the foreign key value must match a candidate key value of some tuple in its home relation or the foreign key value must be wholly null. |
| | Down:1. | Candidate keys that are not chosen to perform identification tasks. | 2. | “Is-a” relationship between a Superclass (Parent) and Subclasses (Child) | 4. | Another name for identifier | 5. | Number of instances of one class that may relate to a single instance of another class. | 7. | Property of an object |
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© 2016
PuzzleFast.com, Noncommercial Use Only
Crossword Puzzle for Lecture 3 & 4
Across:3. | A row of record in a table. | 5. | The name of an attribute that stores many values. | 6. | Number of tuples it contains. | 8. | Number of attributes it contains. | 9. | Integrity rule that states if a foreign key exists in a relation, either the foreign key value must match a candidate key value of some tuple in its home relation or the foreign key value must be wholly null. |
| | Down:1. | Candidate keys that are not chosen to perform identification tasks. | 2. | “Is-a” relationship between a Superclass (Parent) and Subclasses (Child) | 4. | Another name for identifier | 5. | Number of instances of one class that may relate to a single instance of another class. | 7. | Property of an object |
| |
© 2016
PuzzleFast.com, Noncommercial Use Only