SQL代寫|數據庫代寫|Assignment代寫 - COMP3311 20T3 Assignment 2
This assignment aims to give you practice in reading and understanding a moderately large relational schema (MyMyUNSW) implementing SQL queries and views to satisfy requests for information implementing PLpgSQL functions to aid in satisfying requests for information The goal is to build some useful data access operations on the MyMyUNSW database, which contains a wealth of information about what happens at UNSW. One aim of this assignment is to use SQL queries (packaged as views) to extract such information. Another is to build PlpgSQL functions that can support higher-level activities, such as might be needed in a Web interface. A theme of this assignment is "dirty data". As I was building the database, using a collection of reports from UNSW's information systems and the database for the academic proposal system (MAPPS), I discovered that there were some inconsistencies in parts of the data (e.g. duplicate entries in the table for UNSW buildings, or students who were mentioned in the student data, but had no enrolment records, and, worse, enrolment records with marks and grades for students who did not exist in the student data). I removed most of these problems as I discovered them, but no doubt missed some. Some of the exercises below aim to uncover such anomalies; please explore the database and let me know if you find other anomalies.