________ displays only the rows that meet the criteria or conditions you specify to limit which records are included in the results
A) Criteria B) AutoFiltering C) Filtering D) Custom filtering
C
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Provide the equivalent domain relational calculus and relational algebra expressions for each of the tuple relational calculus expressions given in Exercise 4.10.
(a) {H.hotelName | Hotel(H) ? H.city = ‘London’} (b) {H.hotelName | Hotel(H) ? (?R) (Room(R) ? H.hotelNo ? R.hotelNo?? R.price ? 50)} (c) {H.hotelName | Hotel(H) ? (?B) (?G) (Booking(B) ? Guest(G) ? H.hotelNo ? B.hotelNo?? B.guestNo = G.guestNo ?? G.guestName = ‘John Smith’)} (d) {H.hotelName, G.guestName, B1.dateFrom, B2.dateFrom | Hotel(H) ? Guest(G) ? Booking(B1) ? Booking(B2) ? H.hotelNo ? B1.hotelNo?? G.guestNo = B1.guestNo ?? B2.hotelNo = B1.hotelNo ? B2.guestNo = B1.guestNo ?? B2.dateFrom ? B1.dateFrom}
Which of the following statements about a do…while iteration statement is true?
a. The body of a do…while loop is executed only if the terminating condition is true. b. The body of a do…while loop is executed only once. c. The body of a do…while loop is always executed at least once. d. None of the above.
Which database function will return the largest value from a dataset based on preset criteria?
A) DMIN B) DCOUNT C) DSUM D) DMAX
An administrator thinks that a particular network connection is dropping packets. Which of the following tools would the administrator use to BEST identify where the packets are being dropped?
A. tracert B. ping C. nslookup D. netstat