Introduction to Database System Which of the following is NOT a basic element of all versions of the E-R model? Relationships Primary keys Attributes Entities Relationships Primary keys Attributes Entities ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System In SQL, which of the following is not a data Manipulation Language Commands? DELETE UPDATE CREATE SELECT DELETE UPDATE CREATE SELECT ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System An audit trail All of the listed here is the recorded history of operations performed on a file can be used to restore lost information is used to make back-up copies All of the listed here is the recorded history of operations performed on a file can be used to restore lost information is used to make back-up copies 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 SELECT DISTINCT SELECT DIFFERENT SELECT UNIQUE All of these None of these SELECT DISTINCT SELECT DIFFERENT SELECT UNIQUE All of these None of these ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Entities use identifiers while tables use keys. 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 changing the data is one spot will cause data inconsistency None of these storage space is wasted both (a) and (b) it can be more easily accessed changing the data is one spot will cause data inconsistency None of these storage space is wasted both (a) and (b) ANSWER DOWNLOAD EXAMIANS APP
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