Which of the following operations is not a stack operation?
A) remove and return an item with a specified value
B) set the element at the bottom of the stack to a specified value
C) remove and return the item at a specified position
D) All of the above: that is, none of the above are stack operations
D) All of the above: that is, none of the above are stack operations
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Suppose we do not require that all attributes in the primary key are non-null and instead request that, in every tuple, at least one key (primary or candidate) does not have nulls in it. (Tuples can have nulls in other places and the non-null key can be di?erent for di?erent tuples.) Give an example of a relational instance that has two distinct tuples that might become one once the values for all nulls become known (that is, are replaced with real values). Explain why this is not possible when one key (such as the primary key) is designated to be non-null for all tuples in the relation.
What will be an ideal response?
Which of the following is NOT an important consideration when disposing of a computer?
A) donating a still usable computer to a local charity B) disposing of personal data possibly stored on the hard drive C) throwing out the old mouse and keyboard since they rarely fail D) deciding how to handle the hard drive
Which of the following is NOT an element of asymmetric cryptography?
A. Public key B. Key pairs C. Hash algorithm D. Private key
A ________ displays the data from an underlying table or query on multiple pages
Fill in the blank(s) with correct word