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Question
Saying that two entities are functionally dependent means that ________.A) the entities are always connected by a mathematical equation
B) for one of the entities, if we are given the value of that entity, we can determine the value of one other entity
C) for both of the entities, if we are given the value of one entity, we can determine the value of the other entity
D) the functional dependency will have to be removed through normalization
Answer
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Related questions
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Suppose you have created a data model for an airline based on a variety of forms, reports, user interviews, data sources, etc. Your client comes forward with a new desired report that includes passenger weights and a relationship between passengers and employees, neither of which is in your E-R diagram. You should ________.
A) create a new, separate E-R diagram with just the new information
B) add the relationship and the weight attribute to the existing data model
C) add the relationship but not the weight attribute
D) add the weight attribute but not the relationship
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ID-dependent entities are a common type of weak entity.
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An entity that represents something that can exist on its own is called a strong entity.
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In an E-R model, the three types of minimum cardinality are mandatory, optional, and indeterminate.
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In a 1:N relationship, the term parent refers to the N side of the relationship.
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Relationships are classified by their cardinality.
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In today's E-R models, attributes of relationships are still used.
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Explain denormalization, and why it may be appropriate to denormalize a set of tables.
Q:
When accessing table structure, how do you determine how many rows are in a table?
Q:
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A) IS
B) IS NOT
C) IS NULL
D) COUNT(NULL)
Q:
When a table is created using existing data from multiple sources, you are likely to find that the different sources code data in slightly different ways. This is an example of ________.
A) the multivalued, multicolumn problem
B) the inconsistent values problem
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Q:
A classic example of unneeded normalization is when we are dealing with ________.
A) ZIP codes
B) sales orders and line items
C) association patterns
D) multivalued dependencies
Q:
The SQL keyword TOP ________.
A) limits the number of columns retrieved from a table
B) limits the number of rows retrieved from a table
C) limits the number of tables retrieved from a database
D) A and C
Q:
During the second step of assessing table structure, you are trying to determine ________.
A) relationships
B) candidate keys
C) updatability
D) efficiency
Q:
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A) counting rows
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Q:
The SQL INSERT statement can be used to populate normalized tables.