Given Aiis the ith attribute, Di is the ith domain name, which one of the following expressions is a relation schema? ( ) Re (A1:D1, A2:D2, A3:D3,…, An:Dn) ( ) (A1:D1, A2:D2, A3:D3,…, An:Dn) ( ) Re (A1, A2, …, Ai,…, An) ( ) Re (D1: A1 , D2: A2, …, Di: Ai,…, Dn: An)

Given Aiis the ith attribute, Di is the ith domain name, which one of the following expressions is a relation schema? ( ) Re (A1:D1, A2:D2, A3:D3,…, An:Dn) ( ) (A1:D1, A2:D2, A3:D3,…, An:Dn) ( ) Re (A1, A2, …, Ai,…, An) ( ) Re (D1: A1 , D2: A2, …, Di: Ai,…, Dn: An)

Database Systems: Design, Implementation, & Management

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ISBN:9781285196145

Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Chapter10: Transaction Management And Concurrency Control

Section: Chapter Questions

Problem 1P

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Question

16.Given A_iis the i^th attribute, D_i is the i^th domain name, which one of the following expressions is a relation schema?
( ) Re (A₁:D₁, A₂:D₂, A₃:D₃,…, A_n:D_n)
( ) (A₁:D₁, A₂:D₂, A₃:D₃,…, A_n:D_n)
( ) Re (A₁, A₂, …, A_i,…, A_n)
( ) Re (D₁: A₁ , D₂: A₂, …, D_i: A_i,…, D_n: A_n)

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