Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question 7
Assume you have a map of key/values pairs of (UINS->NETIDS). The keys are the UINS and the values are the NTEIDs. Also assume this map is named: students
What happens, if you look up a UIN that is not currently stored in the map using the following code?
string netid = students [234345456];
O The UIN, 234345456, will be added to the map.
O There will be an error.
O The value stored in the string netid will be "null".
O The map will be cleared of all of its values
A Moving to the next question prevents changes to this answer.
8°F
rch
hp
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Transcribed Image Text:Question 7 Assume you have a map of key/values pairs of (UINS->NETIDS). The keys are the UINS and the values are the NTEIDs. Also assume this map is named: students What happens, if you look up a UIN that is not currently stored in the map using the following code? string netid = students [234345456]; O The UIN, 234345456, will be added to the map. O There will be an error. O The value stored in the string netid will be "null". O The map will be cleared of all of its values A Moving to the next question prevents changes to this answer. 8°F rch hp
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