Exercise 1 Question 1 The CBD and South East Light Rail is a new light rail network for Sydney, currently under construction. The 12km route will feature 19 stops, extending from Circular Quay along George Street to Central Station, through Surry Hills to Moore Park, then to Kensington and Kingsford via Anzac Parade and Randwick […]
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Assignment 1 Please make sure that you always use notations consistent with lecture notes. Different notations will not be accepted. The deadline for assignment 1 is: Fri 12 Mar, 5:00 pm Question 1 (6 marks) A car dealership organization hires you to design a small database, and gives you the following requirements: A dealership is
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Microsoft Word – Exercise 4_Database Storage Structures and Transaction Management.docx Exercise 4 Question 1 Give and justify the answers regarding the following problems: a) Construct a scenario that First in First Out (FIFO) buffer replacement policy is better than Most Recently Used (MRU) buffer replacement policy. b) Construct a scenario that First in First Out
SQL SQL 1 SQL-99 SQL = Structured Query Language (pronounced “sequel”). An ANSI/ISO standard language for querying and manipulating relational DBMSs. Developed at IBM (San Jose Lab) during the 1970’s, and standardised during the 1980’s. Appears that SQL will survive the rise of object-relational database systems. Designed to be a “human readable” language supporting: ◦
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Microsoft Word – Exercise 2_Relational Algebra.docx Exercise 2 A) Question 1 Get the student ids of the students who got more than 70 marks in the subject 1011. Question 2 Get the names and subject codes for which the students got more than 70 marks in the subject. B) Consider the following relational schemas: author
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Project 1 SQL and PLpgSQL Project 1 SQL The deadline for project 1 is: Thu 1 Apr, 5:00 pm (Sydney time) for Q1-Q12 Fri 9 Apr, 5:00 pm (Sydney time) for Q13 1. Aims This project aims to give you practice in • reading and understanding a moderately large relational schema (MyMyUNSW). • implementing SQL
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Tree-Structured Indexes Introduction As for any index, 3 alternatives for data entries k*: – Data record with key value k – – § Choice is orthogonal to the indexing technique used to locate data entries k*. § Tree-structured indexing techniques support both range searches and equality searches. § ISAM: static structure; B+ tree: dynamic, adjusts
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Microsoft Word – Exercise 4_Database Storage Structures and Transaction Management_Solution.docx Exercise 4 – Solution Q1 a) Consider the capacity of the buffer pool is 4 and the request frame sequence is 1,2,3,4,5,4,5,4… b) Consider the capacity of the buffer pool is 4 and the request frame sequence is 1,2,3,4,1,2,3,5,4… Q2 Suppose we have n frames
PLpgSQL PLpgSQL PROCEDURAL LANGUAGE EXTENSIONS FOR THE PGSQL 1 Limitations of Basic SQL What we have seen of SQL so far: ◦ data definition language (create table(…)) ◦ constraints (domain, key, referential integrity) ◦ query language (select…from…where…) ◦ views (give names to SQL queries) This is not sufficient to write complete applications. More extensibility and
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COMP9311 DATABASE SYSTEMS • Xuemin L in • Schoo l o f Compu te r Sc ience and Eng inee r i ng • Off i ce : K17 -503 • E-ma i l : l xue@cse .unsw.edu .au • Ex t : 6493 • h t tp : / /www.cse .unsw.edu .au /~ l
CS计算机代考程序代写 SQL Functional Dependencies database compiler ER algorithm COMP9311 Read More »