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describe your understanding of hash tables in your own words. Give examples whenever possible.

describe your understanding of hash tables in your own words. Give examples whenever possible.

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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**Transcription:** **Question: Describe your understanding of hash tables in your own words. Give examples whenever possible.** **Detailed Explanation:** This question prompts students to explain the concept of hash tables, a fundamental data structure in computer science. Students should provide a detailed description in their own words and include practical examples to illustrate their understanding. Hash tables are data structures that store key-value pairs. They are particularly well-suited for scenarios where fast data retrieval is crucial. Hash tables use a hash function to compute an index (also called a hash code) into an array of buckets or slots. From this computed index, the desired data can be found easily. For example, consider a simple phonebook application where you need to look up phone numbers based on people's names. Using a hash table, you'd hash each name to obtain an index, then store the corresponding phone number at that index. When you need to retrieve a phone number, you'd hash the person's name again to get the index and then look up the number at that index. This allows for very fast lookups, typically in constant time. Further explanations can include handling collisions via techniques such as chaining (storing multiple elements at the same index in a list) or open addressing (finding another open slot within the array). Students can strongly benefit from drawing parallels to real-world applications and providing code snippets or pseudo-code to solidify their explanations.
Transcribed Image Text:**Transcription:** **Question: Describe your understanding of hash tables in your own words. Give examples whenever possible.** **Detailed Explanation:** This question prompts students to explain the concept of hash tables, a fundamental data structure in computer science. Students should provide a detailed description in their own words and include practical examples to illustrate their understanding. Hash tables are data structures that store key-value pairs. They are particularly well-suited for scenarios where fast data retrieval is crucial. Hash tables use a hash function to compute an index (also called a hash code) into an array of buckets or slots. From this computed index, the desired data can be found easily. For example, consider a simple phonebook application where you need to look up phone numbers based on people's names. Using a hash table, you'd hash each name to obtain an index, then store the corresponding phone number at that index. When you need to retrieve a phone number, you'd hash the person's name again to get the index and then look up the number at that index. This allows for very fast lookups, typically in constant time. Further explanations can include handling collisions via techniques such as chaining (storing multiple elements at the same index in a list) or open addressing (finding another open slot within the array). Students can strongly benefit from drawing parallels to real-world applications and providing code snippets or pseudo-code to solidify their explanations.
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