Introduction to Database System In a relation, the columns are sometimes called "attributes". False True False True ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System The activity of a file is a measure of the percentage of existing records updated during a run refers to how closely the files fits into the allocated is a low percentages of number of records added or deleted from a file if high, reduces processing efficiency for sequential and nonsequential files None of these is a measure of the percentage of existing records updated during a run refers to how closely the files fits into the allocated is a low percentages of number of records added or deleted from a file if high, reduces processing efficiency for sequential and nonsequential files None of these ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System If attributes A and B determine attribute C, then it is also true that: C is a determinant. B → A → (A,B) is a composite determinant. C is a determinant. B → A → (A,B) is a composite determinant. ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System A key is a group of one or more attributes that uniquely identifies a row. True False True False ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System If a piece of data is stored in two places in the database, then it can be more easily accessed None of these changing the data is one spot will cause data inconsistency both (a) and (b) storage space is wasted it can be more easily accessed None of these changing the data is one spot will cause data inconsistency both (a) and (b) storage space is wasted ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Which of the following indicates the maximum number of entities that can be involved in a relationship? ERD Maximum cardinality Minimum cardinality Greater Entity Count (GEC) ERD Maximum cardinality Minimum cardinality Greater Entity Count (GEC) ANSWER DOWNLOAD EXAMIANS APP
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