Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Chapter 2, Problem 18E
Explanation of Solution
a.
Relational algebra statement:
ΠID( σdept_name =“Physics” (in...
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b.
Relational algebra statement:
ΠID,name(σbuilding=“Watson”((instructor ⋈instructor.ID=teaches.ID teaches) ⋈teaches...
Explanation of Solution
c.
Relational algebra statement:
∏ID,name(student ⋈ takes ⋈ ∏course_id(σdept_name= ‘Comp.Sci...
Explanation of Solution
d.
Relational algebra statement:
∏ID,name(student ⋈ takes ⋈ ∏course_id(σdept_name= ‘Comp.Sci...
Explanation of Solution
e.
Relational algebra statement:
∏ID,name(student ⋈ takes ⋈ ∏course_id(σdept_name= “null...
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# Find the error# Why will the following code not print out a list of contact namesphoneBook = {'Doe, Jane' : '843-000-0000' ,'Doe, John' : '843-111-1111' ,'Smith, Adam' : '843-222-2222' ,'Jobs, Steve' : '999-333-3333' ,}for contact in phoneBook.values():print(contact)
# Find the error:# The following code creates an empty dictionary and attempts to add a record# Why will the following code not create a new dictionary entry as intended?phoneBook = {}phoneBook{'Jobs, Steve'} = '999-111-1111'
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