EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133544886
Author: AUER
Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)
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Chapter 2, Problem 2.6RQ
Explanation of Solution
The circumstances under which an attribute of a relation be of variable length:
The circumstance in which an attribute of a relation be of variable length is:
- An attribute is a characteristic of a
database . - A relation is a table in a relational database which contains one or more data categories in columns...
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An active-HIGH pulse (HIGH level when asse rted, LOW level when not) is required on an i nverter input.(a) Draw the appropriate logic symbol, using t he distinctive shape and the negation indicat or, for the inverter in this application.(b) Describe the output when a positive-goin g pulse is applied to the input of an inverter.
Convert this question to Subroutines
ORG 100
LDA A1
STA T1
LDA B1
STA T2
LDA T1 I
STA A1 I
ISZ B1
ISZ A1
ISZ ENC
BUN L2
//COMPUTER
HLT
L1,
INC
A1,
HEX 5000
STA T2 1
B1,
HEX 6000
ISZ T1
T1,
HEX O
ISZ T2
T2,
HEX 0
ISZ DCD
DCD,
DEC -8
BUN L1
// DPNQVUFS
ENC,
DEC -8
LDA B1 I
DEC,
HEX FF
L2,
ADD DEC
END
Convert this question to Subroutines
> F = [(A. B) + (A'. B')]” = [(A. B)'. (A'. B')']'
ORG 100
LDA A
// Load A operand to AC
HLT
// END Program
AND B
CMA
STA T1
LDA A
CMA
STA T2
LDA B
CMA
AND T2
CMA
// Store AC result in T1
// Load A operand to AC
// Complement result in AC
// Store AC [A'] result in T2
// Load B operand to AC
// Complement result in AC
// AND B' with T2[A'] operand
// Complement result in AC
AND T1 // AND [(A'.B')'] with T1[(A.B)']
CMA // Complement result in AC
STA F // Store AC result in F
// AND A operand with B operand
B,
HEX 01
// Complement result in AC
A,
HEX 01
T1,
HEX O
T2,
HEX 0
F,
HEX 0
END
Chapter 2 Solutions
EBK DATABASE CONCEPTS
Ch. 2 - Prob. 2.1RQCh. 2 - Define the term entity, and give an example of an...Ch. 2 - Prob. 2.3RQCh. 2 - Prob. 2.4RQCh. 2 - Prob. 2.5RQCh. 2 - Prob. 2.6RQCh. 2 - Prob. 2.7RQCh. 2 - Prob. 2.8RQCh. 2 - Prob. 2.9RQCh. 2 - Define the term unique key and give an example.
Ch. 2 - Prob. 2.11RQCh. 2 - Prob. 2.12RQCh. 2 - Prob. 2.13RQCh. 2 - Describe four uses of a primary key.Ch. 2 - Prob. 2.15RQCh. 2 - Prob. 2.16RQCh. 2 - Prob. 2.17RQCh. 2 - Explain the term foreign key, and give an example.Ch. 2 - Prob. 2.19RQCh. 2 - Prob. 2.20RQCh. 2 - Explain three possible interpretations of a null...Ch. 2 - Give an example of a null value (other than one...Ch. 2 - Prob. 2.23RQCh. 2 - Prob. 2.24RQCh. 2 - Prob. 2.25RQCh. 2 - Prob. 2.26RQCh. 2 - Prob. 2.27RQCh. 2 - Define the term primary key in terms of functional...Ch. 2 - Prob. 2.31RQCh. 2 - Examine the data in the Veterinary Office...Ch. 2 - Prob. 2.33RQCh. 2 - Describe a modification problem that occurs when...Ch. 2 - Prob. 2.35RQCh. 2 - Prob. 2.36RQCh. 2 - Prob. 2.37RQCh. 2 - Apply the normalization process to the Veterinary...Ch. 2 - Prob. 2.39ECh. 2 - Prob. 2.40E
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