Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Textbook Question
Chapter 4, Problem 19MC
Which of the following types of restrictions can be viewed with the DESCRIBE command?
- a. NOT NULL
- b. FOREIGN KEY
- c. UNIQUE
- d. CHECK
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I would like to get help to resolve the following case
Last Chance Securities
The IT director opened the department staff meeting today by saying, "I've got some good news and
some bad news. The good news is that management approved the payroll system project this morning.
The new system will reduce clerical time and errors, improve morale in the payroll department, and avoid
possible fines and penalties for noncompliance. The bad news is that the system must be installed by
January 1st in order to meet new federal reporting rules, all expenses from now on must be approved in
advance, the system should have a modular design if possible, and the vice president of finance would
like to announce the new system in a year-end report if it is ready by mid-December."
Tasks
1. Why is it important to define the project scope? How would you define the scope of the payroll
project in this case?
2. Review each constraint and identify its characteristics: present versus future, internal versus exter-
nal, and mandatory versus desirable.
3. What…
2. Signed Integers
Unsigned binary numbers work for natural numbers, but many calculations use negative
numbers as well. To deal with this, a number of different methods have been used to represent
signed numbers, but we will focus on two's complement, as it is the standard solution for
representing signed integers.
2.1 Two's complement
• Most significant bit has a negative value, all others are positive. So, the value of an n-digit
-2
two's complement number can be written as: Σ2 2¹ di 2n-1 dn
• Otherwise exactly the same as unsigned integers.
i=0
-
• A neat trick for flipping the sign of a two's complement number: flip all the bits (0 becomes 1,
or 1 becomes 0) and then add 1 to the least significant bit.
• Addition is exactly the same as with an unsigned number.
2.2 Exercises
For questions 1-3, answer each one for the case of a two's complement number and an
unsigned number, indicating if it cannot be answered with a specific representation.
1. (15 pts) What is the largest integer…
Chapter 4 Solutions
Oracle 12c: SQL
Ch. 4 - What is the difference between a PRIMARY KEY...Ch. 4 - How can you verify the constraints that exist for...Ch. 4 - A table can have a maximum of how many PRIMARY KEY...Ch. 4 - Which type of constraint can be used to make...Ch. 4 - Which type of constraint should you use to ensure...Ch. 4 - How is adding a NOT NULL constraint to an existing...Ch. 4 - When must you define constraints at the table...Ch. 4 - Prob. 8RQCh. 4 - What is the difference between disabling a...Ch. 4 - Prob. 10RQ
Ch. 4 - Prob. 1MCCh. 4 - Which of the following is not a valid constraint...Ch. 4 - Which of the following SQL statements is invalid...Ch. 4 - What is the maximum number of PRIMARY KEY...Ch. 4 - Prob. 5MCCh. 4 - How many NOT NULL constraints can be created at...Ch. 4 - The FOREIGN KEY constraint should be added to...Ch. 4 - What is the maximum number of columns you can...Ch. 4 - Which of the following commands can you use to...Ch. 4 - Prob. 10MCCh. 4 - In the initial creation of a table, if a UNIQUE...Ch. 4 - Which type of constraint should you use on a...Ch. 4 - Which of the following commands can be used to...Ch. 4 - Which of the following keywords allows the user to...Ch. 4 - Which of the following data dictionary objects...Ch. 4 - Which of the following types of constraints cant...Ch. 4 - Suppose you created a PRIMARY KEY constraint at...Ch. 4 - You’re creating a new table consisting of three...Ch. 4 - Which of the following types of restrictions can...Ch. 4 - Which of the following is the valid syntax for...Ch. 4 - Prob. 1HOACh. 4 - Prob. 2HOACh. 4 - Prob. 3HOACh. 4 - Add a column named Base_salary with a datatype of...Ch. 4 - Create a table named BOOK_STORES to include the...Ch. 4 - Add a constraint to make sure the Rep_ID value...Ch. 4 - Change the constraint created in Assignment #6 so...Ch. 4 - Create a table named REP_CONTRACTS containing the...Ch. 4 - Produce a list of information about all existing...Ch. 4 - Issue the commands to disable and then enable the...
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- can u solve this questionarrow_forward1. Unsigned Integers If we have an n-digit unsigned numeral dn-1d n-2...do in radix (or base) r, then the value of that numeral is n−1 r² di Σi=0 which is basically saying that instead of a 10's or 100's place we have an r's or r²'s place. For binary, decimal, and hex r equals 2, 10, and 16, respectively. Just a reminder that in order to write down a large number, we typically use the IEC or SI prefixing system: IEC: Ki = 210, Mi = 220, Gi = 230, Ti = 240, Pi = 250, Ei = 260, Zi = 270, Yi = 280; SI: K=103, M = 106, G = 109, T = 10¹², P = 1015, E = 10¹8, Z = 1021, Y = 1024. 1.1 Conversions a. (15 pts) Write the following using IEC prefixes: 213, 223, 251, 272, 226, 244 21323 Ki8 Ki 223 23 Mi 8 Mi b. (15 pts) Write the following using SI prefixes: 107, 10¹7, 10¹¹, 1022, 1026, 1015 107 10¹ M = 10 M = 1017102 P = 100 P c. (10 pts) Write the following with powers of 10: 7 K, 100 E, 21 G 7 K = 7*10³arrow_forwardanswer shoul avoid using AI and should be basic and please explainarrow_forward
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- answer should avoid using AI (such as ChatGPT), do not any answer directly copied from AI would and explain codearrow_forwardWrite a c++ program that will count from 1 to 10 by 1. The default output should be: 1, 2, 3, 4, 5, 6 , 7, 8, 9, 10 There should be only a newline after the last number. Each number except the last should be followed by a comma and a space. To make your program more functional, you should parse command line arguments and change behavior based on their values. Argument Parameter Action -f, --first yes, an integer Change place you start counting -l, --last yes, an integer Change place you end counting -s, --skip optional, an integer, 1 if not specified Change the amount you add to the counter each iteration -h, —help none Print a help message including these instructions. -j, --joke none Tell a number based joke. So, if your program is called counter, counter -f 10 --last 4 --skip 2 should produce 10, 8, 6, 4 Please use the last supplied argument. If your code is called counter, counter -f 4 -f 5 -f 6 should count from 6. You should…arrow_forwardshow workarrow_forward
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