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Question
In a correlated subquery of a database that has tables TableOne and TableTwo, if table TableOne is used in the upper SELECT statement, then which table is used in the lower SELECT statement?A) TableOne
B) TableTwo
C) Both TableOne and TableTwo
D) Either TableOne or TableTwo
Answer
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Related questions
Q:
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
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Q:
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C) Subtypes are used to avoid a situation in which some attributes are required to be null.
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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.
Q:
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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Q:
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Q:
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Q:
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Q:
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Q:
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Q:
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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 ________.
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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
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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
B) examining columns
C) examining data values
D) Both A and B are correct
Q:
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Q:
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Q:
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Q:
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Q:
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