Which of the following is not a rule that must be followed when naming identifiers?
a. After the first character, you may use the letters a-z, A-Z, an underscore, a dollar sign, or the digits 0-9.
b. Identifiers can contain spaces.
c. Uppercase and lowercase characters are distinct.
d. The first character must be one of the letters a-z, A-Z, an underscore, or a dollar sign.
b. Identifiers can contain spaces.
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A function-message must be sent from a place where a statement can appear.
Answer the following statement true (T) or false (F)
Using the Hotel schema given at the start of the Exercises at the end of Chapter 4, determine whether the following queries are semantically correct:
(a) SELECT r.type, r.price FROM Room r, Hotel h WHERE r.hotel_number = h.hotel_number AND h.hotel_name = ‘Grosvenor Hotel’ AND r.type > 100; (b) SELECT g.guestNo, g.name FROM Hotel h, Booking b, Guest g WHERE h.hotelNo = b.hotelNo AND h.hName = ‘Grosvenor Hotel’; (c) SELECT r.roomNo, h.hotelNo FROM Hotel h, Booking b, Room r WHERE h.hotelNo = b.hotelNo AND h.hotelNo = ‘H21’ AND b.roomNo = r.roomNo AND type = ‘S’ AND b.hotelNo = ‘H22’;
Which statement creates a random value from the sequence 2, 5, 8, 11 and 14. Suppose randomNumbers is a SecureRandom object.
a. 2 + 5 * randomNumbers.nextInt(3); b. 3 + 2 * randomNumbers.nextInt(5); c. 5 + 3 * randomNumbers.nextInt(2); d. 2 + 3 * randomNumbers.nextInt(5);
________ are the conditions specified in the logical test argument of the IF function
A) Comparison operators B) Conditions C) TRUE/FALSE values D) Criteria