EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133777840
Author: AUER
Publisher: VST
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Chapter 2, Problem 2.9RQ
Program Plan Intro
Relation:
Relation is a two-dimensional table in which data is named. The relations have the named columns and numbers which denote the unnamed rows.
- Although relation is defined as the two-dimensional table of data, not all the tables are considered as relations.
- There are some properties that differentiate relation tables from non-relation tables.
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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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- If you assume that a relation has no duplicate data, how do you know there is always at least one primary key?arrow_forwardA relation is a function only if any two first values in the pairs are the same. True or Falsearrow_forwardtrue/false INNER JOIN combines two relations. It takes the second relation, and appends it to the end of the first relation. In Corelated Subqueries, subquery is executed independent of the outer query: subquery is executed only once. SELECT * FROM sys.Relations displays information about all the user-defined relations within a database. Given GENDER and STUDENT relations, SELECT Gender, FName, LName FROM GENDER LEFT OUTER JOIN STUDENT ON STUDENT.GenderCode = GENDER.GenderCode ≡ SELECT Gender,FName, LName FROM STUDENT RIGHT OUTER JOIN GENDER ON STUDENT.GenderCode = GENDER.GenderCode The statements select RIGHT('I wish I had attended the practice hours', 9) and select…arrow_forward
- What is a well-structured relation?arrow_forward101. The basic operations that can be performed on relations are a. deletion b. insertion c. modification d. all of abovearrow_forwardSuppose relations R(A,B) and S(B,C,D) have the tuples shown below: R A B 5 3 4 46 8 479 Compute the result of the join query: SELECT A, R.B, S.B, C, D FROM R, S WHERE R.Aarrow_forwardWrite appropriate SQL DDL statements for declaring the database "Employee", assign admin privilege to user "AMAL" Write appropriate SQL DDL statements for declaring the table PERSONS. Specify all constraints: Field Null key PersonID No PRIMARY No LastName varchar(30) FirstName varchar(30) No Address varchar(50) YES City varchar(30) YES Type intarrow_forwardWhat are the references to the main key in the same relation?arrow_forwardWhat three situations make it necessary to make a substitute key instead of the main key of a relation?arrow_forwardAny relation must have at least ONE Select one: a. Foreign Key b. Composite key c. Alternate key d. Candidate keyarrow_forwardWhat are the benefits of normalisation methods that use functional dependencies?arrow_forwardPlease help with the folllowing: Consider the following declaration of a relation schema CREATE TABLE R ( A int PRIMARY KEY, B int not null, C char (1) ); Then execution of which of the following queries will fail? QI: Insert INTO R (B, C) Values (353, 'B'); Q2: Insert INTO R (A, C) Values (111, ‘A’); Q3: Insert INTO R (A, B) Values (222, 335); Select one: a. Both QI and Q2 b. QI only c. Both QI and Q3 d. Q2 onlyarrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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