What kind of relationship model describes inheritance?
A. friendly
B. was a
C. is a
D. base class
C. is a
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Consider the following relational schema:
Assume that keys are underlined and:
The relation Employee is sorted on the Id attribute.
In Department: Unclustered index on DeptName; clustered on Building. No other
indices.
Dozens of departments can reside in the same building.
(a) Write an SQL query that generates a table of employee names who work for department
?Sales? in building E213.
(b) Give the ?naive? translation of your SQL query into the relational algebra (as given by
the general translation of SQL to relational algebra.)
(c) Describe carefully and completely how you would actually most eciently evaluate the
above query. That is, list the precise sequence of relational operations to be performed,
the relations on which these operations are to be performed, and the methods to be used
to compute the result of each operation. (As part of the solution you will need to decide
which index to use and why.)
After inserting the new element in the heap, the list might no longer be a heap.
Answer the following statement true (T) or false (F)
Originally developed by IBM, what protocol is used by Windows to share files and printers on a network?
A. Server Message Block (SMB) B. Lightweight Directory Access Protocol (LDAP) C. File Transfer Protocol (FTP) D. Hypertext Transfer Protocol (HTTP)
Describe a situation in which you would want to increase cell margins. Also provide an example of when reducing cell margins would be beneficial.
What will be an ideal response?