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CS 669 Final Exam|All Possible Questions and Answers|Graded A+|Latest Update
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CS 669 Final Exam|All Possible Questions and Answers|Graded A+|Latest Update
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CS 669 Final Exam|All Possible Questions andAnswers|Graded A+|Latest Update
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1 of 226
Definition
This type of trigger is executed once, before or after the triggering
statement is completed. This is the default case.
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, System Event Trigger Statement Trigger
Commit Dml Trigger
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2 of 226
Definition
A SQL aggregate function that outputs the number of rows containing
not null values for a given column or expression, sometimes used in
conjunction with the DISTINCT clause (Distinct will eliminate duplicate
rows in the result set).
Most aggregate functions take a single attribute as the parameter;
however, COUNT allows the asterisk () wildcard to indicate that the
number of rows should be returned without regard to the values in
any particular column ( will count nulls)
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Max function COUNT function
Rows function Volume function
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, 3 of 226
Definition
A restriction placed on data, usually expressed in the form of rules. For
example, "A student's GPA must be between 0.00 and 4.00." A
restriction that data must satisfy.
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Entity Attribute
Relationship Constraint
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Definition
In query optimization, a delay introduced in the processing of an I/O
operation that causes the overall system to slow down.
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Cost Based Optimizer Query Processing Bottleneck
, Bcnf Query Optimizer
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Term
Inheritance means that ....
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An entity subtype inherits the
An entity subtype overrides the
attributes and relationships of
attributes of the supertype.
the supertype.
An entity subtype creates new
An entity subtype can only exist
attributes that are not present in the
independently of the supertype.
supertype.
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