Introduction to Database System The activity of a file is a low percentages of number of records added or deleted from 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 None of these if high, reduces processing efficiency for sequential and nonsequential files is a low percentages of number of records added or deleted from 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 None of these if high, reduces processing efficiency for sequential and nonsequential files ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Which of the following is not a restriction for a table to be a relation? All of the entries in any column must be of the same kind. The cells of the table must contain a single value. The columns must be ordered. No two rows in a table may be identical. All of the entries in any column must be of the same kind. The cells of the table must contain a single value. The columns must be ordered. No two rows in a table may be identical. ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Composite identifiers consist of two or more attributes. True False True False ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System A number of related records that are treated as a unit is called data field file batch data field file batch ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System In SQL, which command is used to changes data in a table? APPEND INSERT UPDATE BROWSE APPEND INSERT UPDATE BROWSE ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System In SQL, which command is used to select only one copy of each set of duplicable rows None of these SELECT DISTINCT SELECT DIFFERENT SELECT UNIQUE All of these None of these SELECT DISTINCT SELECT DIFFERENT SELECT UNIQUE All of these ANSWER DOWNLOAD EXAMIANS APP
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