Modeling‚ decision making‚ and optimization In practical life‚ we have to continually make decisions. Making decisions are required for solving problems so that we can increase our opportunities and make life much easier and beneficial. There are many alternatives for making decisions‚ but making a rightful decision is a harder task. Evaluating these alternatives and choosing the best course of action represents the main essence of decision analysis. For analyzing various decision
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Database management systems A database management system (DBMS) consists of software that operates databases‚ providing storage‚ access‚ security‚ backup and other facilities. Database management systems can be categorized according to the database model that they support‚ such as relational or XML‚ the type(s) of computer they support‚ such as a server cluster or a mobile phone‚ the query language(s) that access the database‚ such as SQL or XQuery‚ performance trade-offs‚ such as maximum scale
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the price greater than 100. d) Guest(σdateTo>’1-June-12’(Booking) It produces a join of guest and booking with an end date greater than June 12. 2. Provide the equivalent tuple relational calculus expressions for each of the relational algebra queries given in question 1 a) ПhotelNo(σprice>100(Room)) TRC: {R.hotelNo | Room(R) /\ R.price > 100} b) σHotel.hotelNo=Room.hotelNo(Hotel X Room) TRC: {H‚ R | Hotel(H) /\ (R) (Room(R) /\ (H.hotelNo = R.hotelNo))} c) ПhotelName(Hotel Hotel.hotelNo=Room
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DATABASE One of the technology terms that most people have become accustomed to hearing either at work or while surfing the Internet is the database. The database used to be an extremely technical term‚ however with the rise of computer systems and information technology throughout our culture‚ the database has become a household term. A database is a structured collection of records or data that is stored in a computer system. In order for a database to be truly functional‚ it must not only store
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Relational Database Design By Paul Litwin This paper was part of a presentation at a Microsoft TechEd conference in the mid-1990s. It was adapted from Microsoft Access 2 Developer’s Handbook‚ Sybex 1994‚ by Ken Getz‚ Paul Litwin and Greg Reddick. Reprinted with permission of the publisher. While the paper uses Microsoft Access (version 2) for the examples‚ the vast majority of the discussion applies to any database and holds up pretty well over 11 years after it was written. Overview Database design
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Database Design Paper “A database is a structured collection of records or data that is stored in a computer system. In order for a database to be truly functional‚ it must not only store large amounts of records well‚ but be accessed easily. In addition‚ new information and changes should also be fairly easy to input.” (tech-faq.com); to ensure usefulness over the long-term‚ databases should be built with high data integrity and the ability to recover data if the hardware fails. Information that
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is whether optimization‚ simulation‚ or a hybrid model (combination of optimization and simulation) is a better option to pursue. In this paper‚ we fundamentally distinguish the two modeling approaches – Supply Chain Optimization vs. Supply Chain Simulation‚ and the scenarios where the each option should be employed. Overview Optimization focuses on finding the optimal solution from millions of possible alternatives while meeting the given constraints of the supply chain. Optimization utilizes mixed
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MODULE: DATABASE DESIGN & DEVELOPMENT ASSIGNMENT TITLE: VETERINARY SURGERY DATABASE DEVELOPMENT Table of Content Task 1 Page 2 Task 2 Page 5 Task 3 Page 14 Task 4 Page 28 Task 5 Page 30 Reference Page 32 Bibliography Page 33 Task 1 Question: AIM: Draw an Entity Relationship Data Model that describes the content and structure of the data held by Petcare. Specify the cardinality ratio and participation constraint of each relationship type. Answer: I have prepared this assignment
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began life as SEQUEL11‚ the Structured English Query Language‚ a component of an IBM research project called System/R. System/R was a prototype of the first relational database system; it was created at IBM’s San Jose laboratories by Donald D. Chamberlin and Raymond F. Boyce in 1974‚ and SEQUEL was the first query language to support multiple tables and multiple users. In the late 1970s‚ SQL made its first appearance in a commercial role as the query language used by the Oracle RDBMS. This was quickly
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Introduction to Databases BDS: Connolly‚ Begg‚ Holowczak Pratt/Adamski Elmasri/Navathe (3rded.) Kroenke Book (7thed.) McFadden (5thed.) Mata-Toledo / Cushman Ch. 1 and 2 Ch. 1 Ch. 1 and 2 Chap. 1 and 2 Chap. 1 Schaum’s Outlines Ch. 1 Q: What is a Database ? Answer from BDS: A shared collection of logically related data and descriptions of that data‚ designed to meet the needs of na organization. Answer from Elmasri/Navathe: A Database (DB) is collection of related data - with the
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