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trains İs a list that contains information about trains associated with a station sta. Specifically, each element in this list is another list: If the arrival or departure [Arrival, Departure]. time is empty, it is represented as "None". flag1 = False, flag2 True count = 0 foreach x in trains { if (first(x) flag1 } else { == "None" or last(x) “None") { =D3= = True count = count + 1 } } if (count length(trains)) { === flag2 = False } %3D

trains İs a list that contains information about trains associated with a station sta. Specifically, each element in this list is another list: If the arrival or departure [Arrival, Departure]. time is empty, it is represented as "None". flag1 = False, flag2 True count = 0 foreach x in trains { if (first(x) flag1 } else { == "None" or last(x) “None") { =D3= = True count = count + 1 } } if (count length(trains)) { === flag2 = False } %3D

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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What does the variable count represent at the end of execution of the above pseudocode?

A. It is number of trains associated with stn It is

B. the number of trains for which stn is a starting station

C. It is the number of trains for which stn is an ending station

D. It is the number of trains for which stn is neither a starting nor an ending station

trains İs a list that contains information about trains associated with a station stn. Specifically, each element in this list is another list: (Arrial, Departure). If the arrival or departure time is empty, it is represented as "None". flag1 = False, flag2 = True count = 0 foreach x in trains { if (first(x) : flag1 = True } else { "None" or last(x) "None") { === == %3D count = count + 1 } } if (count flag2 = False } length(trains)) { 3D%3D
Transcribed Image Text:trains İs a list that contains information about trains associated with a station stn. Specifically, each element in this list is another list: (Arrial, Departure). If the arrival or departure time is empty, it is represented as "None". flag1 = False, flag2 = True count = 0 foreach x in trains { if (first(x) : flag1 = True } else { "None" or last(x) "None") { === == %3D count = count + 1 } } if (count flag2 = False } length(trains)) { 3D%3D
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