When creating an append query, selected fields in the query must match the fields in the table to which the records will be appended. ____________________
Answer the following statement true (T) or false (F)
True
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Consider the following query:
``` SELECT T.CrsCode, T.Grade FROM Transcript T, Student S WHERE T.StudId = S.Id AND S.Name = ’Joe’ ``` Assume that Id is the primary key of Student,(CrsCode, Semester, StudId) is the primary key of Transcript,andthatName is not unique. Set up a database containing these two tables on the DBMS available to you. Initialize the tables with a large number of rows. Write a program that measures the query execution time by reading the clock before and after submitting the query. Be sure to ?ush the cache between successive measurements (perhaps by executing a query that randomly reads a su?cient number of rows of a large dummy table). a. Test your understanding by making an educated guess of what query plan will be chosen by the DBMS assuming that there are no indices other than those for the primary keys. Run the query, output the query plan, and check your guess. Measure the response time. b. Now assume that an unclustered index on StudId on Transcript is added. What query plan would you expect? Run the query, check your answer, and measure the response time. Try the query under two conditions: Joe has taken very few courses; Joe has taken many courses. c. In addition to the index added in (b), assume that an unclustered index on Student on Name has been added and repeat the experiment.
Blogs can serve as all of the following EXCEPT:
A) an individual's personal journal. B) a way for an organization to provide news and information on new products. C) a way for an organization to provide customer service. D) a way for an organization to monitor web usage statistics.
The spacing between tick marks is determined by the ________
A) base value B) rate of increase C) Major unit value D) data marker
What is the purpose of a crimper?
A. to attach the RJ-45 connector to the NIC B. to connect a NIC to a hub C. to connect a RJ-45 connector to the cable D. to install a NIC in a PC