Subqueries and derived tables can add great versatility to SQL statements‚ cut down complexity‚ but can occasionally be a curse when their effect on performance is poorly understood. Surely everyone understands the various types of subqueries and how they are used? If you felt a twinge of doubt‚ here is Rob Sheldon’s easy guide to the subject. ew elements within a Transact-SQL statement are as versatile as the subquery. A subquery—also referred to as an inner query or inner select—is a SELECT
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SDLC is the process of understanding how an information system (IS) can support business needs‚ designing the system‚ building it and delivering it to users. It has four standard phases which include: ◦ ◦ ◦ ◦ Planning Analysis Design Implementation After the four phases are executed‚ some project team perform Maintenance as the last phase. 2 Each phase is itself composed of a series of steps‚ which rely on techniques that produce deliverables. ◦ Deliverables
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Overview and learning goals ‘The overarching goal of this class is to make sure that each and every student is comfortable and skilled at using quantitative information and sound reasoning to address the problems and questions they encounter in planning‚ design‚ and policy-making contexts. This course provides an introduction to methods for developing and evaluating (for the most part) quantitative information in support of planning. The methods considered are widely used by planning practitioners and policy
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Programming Paradigms Programming languages • A Programming language is a notational system for describing tasks/computations in a machine and human readable form. • Most computer languages are designed to facilitate certain operations and not others: numerical computation‚ or text manipulation‚ or I/O. • More broadly‚ a computer language typically embodies a particular programming paradigm. Characteristics of a programming language: Every language has syntax and semantics: • Syntax: The syntax
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The study of Logic Sound reasoning is the basis of winning at argument. Logical fallacies undermine arguments. They are a source of enduring fascination‚ and have been studied for at least two-and-a-half millennia. Knowledge of them is useful‚ both to avoid those used inadvertently by others and even to use a few with intent to deceive. The fascination and the usefulness which they impart‚ however‚ should not be allowed to conceal the pleasure which identifying them can give. I take a very
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Introduction to computer Basics Background This topic will discuss the introduction to the use of the computer in the business area‚ including the basic hardware and software concepts. Information technology (IT) is one of the key resources in the modern business environment. We have lived during the past 20 years in a period that has strongly emphasised the strategic importance of information technology. Consequently‚ those currently involved in management have a clear vision of the technology’s
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days‚ programming languages are becoming more and more general and all-purpose‚ but they still have their specializations‚ and each language has its disadvantages and advantages. Languages can generally be divided into a few basic types‚ though many languages support more than one programming style. This following list isn’t all inclusive or as fine-grained as possible‚ but it brings out some of the basic design decisions behind languages. Language Types • Procedural The programming style
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Genealogy of Programming Languages Pre-computer era Analytical engine The analytical engine‚ an important step in the history of computers‚ was the design of a mechanical general- purpose computer by the British mathematician Charles Babbage. It was first described in 1837. Because of financial‚ political‚ and legal issues‚ the engine was never built. In its logical design the machine was essentially modern‚ anticipating the first completed general-purpose computers by about 100 years. The input
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Chapter 8 Linear Programming Applications To accompany Quantitative Analysis for Management‚ Eleventh Edition‚ Global Edition by Render‚ Stair‚ and Hanna Power Point slides created by Brian Peterson Copyright © 2012 Pearson Education 8-1 Learning Objectives After completing this chapter‚ students will be able to: 1. Model a wide variety of medium to large LP problems. 2. Understand major application areas‚ including marketing‚ production‚ labor scheduling‚ fuel blending‚ transportation‚ and
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Computing &Math. Sc.-University of Greenwich FMI- University of Shumen -BSc Informatics JAVA Programming Lecture 1 March 2007 Lecture notes by Dilwyn Edwards‚ presented by Stanev How do you learn? Programming is very obviously a task-oriented activity and the only way to learn is by doing it. Get as much practice as you can by trying all the exercises and don’t be afraid to try out your own ideas by modifying some of the examples. You can learn a certain amount from online tutorials
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