DATABASE SYSTEM CONCEPTS LCPO
7th Edition
ISBN: 9781265586577
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 4, Problem 2PE
Explanation of Solution
a.
Query for the given instruction:
select ID, name, count (course_id, sec_id, year, semester) as “Sections taught” from instructor natural left outer join teaches group by ID, name.
Explanation:
- Here, get a list with instructor’s ID, name, and the number of sections that they have taught using an outer join.
- Use the natural outer join between instructor and teaches tables.
- Get the instructor’s ID, name, and the number of sections taught by the instructor by using a group by clause on the ID and name attribute...
Explanation of Solution
b.
Query without using outer join:
Select ID, name, (where count (*) as “Section taught” from teaches T where T.id = I.id) from instructor I.
Explanation:
- Display a list with instructor’s ID, name, and the number of sections that they have taught using a sub-query...
Explanation of Solution
c.
Query for the given instruction:
select course_id, sec_id, ID; decode (name, NULL, ‘-’, name) from (section natural left outer join teaches) natural left outer join instructor where semester = ‘Spring’ and year = 2018.
Explanation:
- Initially perform a natural left outer between section, teaches and instructor table...
Explanation of Solution
d.
Query for the given instruction:
select dept_name, count (ID) from department natural left outer join instructor group by dept_name
Explanation:
- Initially perform a natural left outer join between department and instructor table...
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I need help to resolve the case, thank you
In 32-bit MSAM, You were given the following negative array. write a program that converts each array element to its positive representation. Then add all these array elements and assign them to the dl register. .data myarr sbyte -5, -6, -7, -4.code ; Write the rest of the program and paste the fully working code in the space below.
the dl register should have the value 22 after summing up all elements in the array.
Microprocessor 8085 Lab Experiment
Experiment No. 3 Logical Instructions
Write programs with effects
1. B=(2Dh XOR D/2) - (E AND 2Eh+1) when E=53, D=1Dh
2. HL= (BC+HL) XOR DE (use register pair when necessary), when BC=247,
HL 516, DE 12Ach
3. Reset bits 1,4,6 of A and set bits 3,5 when A=03BH
Write all as table (address line.hexacode,opcede,operant.comment with flags)
Chapter 4 Solutions
DATABASE SYSTEM CONCEPTS LCPO
Ch. 4 - Prob. 1PECh. 4 - Prob. 2PECh. 4 - Prob. 3PECh. 4 - Prob. 4PECh. 4 - Prob. 5PECh. 4 - Prob. 6PECh. 4 - Prob. 7PECh. 4 - Prob. 8PECh. 4 - SQL allows a foreign-key dependency to refer to...Ch. 4 -
Given the relations a(name, address, title) and...
Ch. 4 - Prob. 11PECh. 4 - Prob. 12PECh. 4 - Prob. 13PECh. 4 - Prob. 14ECh. 4 - Prob. 15ECh. 4 - Prob. 16ECh. 4 - Prob. 17ECh. 4 - Prob. 18ECh. 4 - Prob. 19ECh. 4 - Show how to define a view tot_credits (year,...Ch. 4 - Prob. 21ECh. 4 - Prob. 22ECh. 4 - Prob. 23ECh. 4 - Prob. 24ECh. 4 - Prob. 25ECh. 4 - Prob. 26E
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