Introduction to Database System Which of the following is not a restriction for a table to be a relation? The columns must be ordered. All of the entries in any column must be of the same kind. No two rows in a table may be identical. The cells of the table must contain a single value. The columns must be ordered. All of the entries in any column must be of the same kind. No two rows in a table may be identical. The cells of the table must contain a single value. ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System A large computer information system maintains many different computer files. Which amongst them is called a perpetual file? Log file Specialized file Master file Update file Log file Specialized file Master file Update file ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Which type of entity is related to two or more associated entities that each contain specialized attributes that apply to some but not all of the instances of the entity? Subtype entity Supertype entity Archetype entity Instance entity Subtype entity Supertype entity Archetype entity Instance entity ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Every time attribute A appears, it is matched with the same value of attribute B, but not the same value of attribute C. Therefore, it is true that: A → (B,C) → A → (B,C). A → A → (B,C) → A → (B,C). A → ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Which of the following is a serious problem of file management systems? program dependence lack of data independence difficult to update data redundancy All of these program dependence lack of data independence difficult to update data redundancy All of these ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System The master list of an indexed file has a number assigned to each record both (b) and (c) contains only a list of keys and record numbers None of these is sorted in ascending order has a number assigned to each record both (b) and (c) contains only a list of keys and record numbers None of these is sorted in ascending order ANSWER DOWNLOAD EXAMIANS APP
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