Lecture-13 Structured Query Language (SQL) Introduction Commercial database systems use more user friendly language to specify the queries. SQL is the most influential commercially marketed product language. Other commercially used languages are QBE‚ Quel‚ and Datalog. Basic Structure The basic structure of an SQL consists of three clauses: select‚ from and where. select: it corresponds to the projection operation of relational algebra. Used to list the attributes desired in the result. from:
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Entity-Relationship (E/R) Model Dr P Sreenivasa Kumar Professor CS&E Dept I I T Madras Entity-Relationship (E/R) Model Widely used conceptual level data model • proposed by Peter P Chen in 1970s Data model to describe the database system at the requirements collection stage • high level description. • easy to understand for the enterprise managers. • rigorous enough to be used for system building. Concepts available in the model • entities and attributes of entities. • relationships between
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Databases In the Workplace klee CIS/207 This paper will discuss the different databases in my organization with regards to what the databases are being used for and any improvements that can be made. To understand how a database helps the day-to-day functions of a business one must first know what a database does and how it works. A database is a “systematized collection of data that can be accessed immediately and manipulated by a data-processing system for a specific purpose” (English Dictionary)
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text‚ there were some apparent rewards and costs at the start of the relationship that have since evolved and changed over the course of the relationship to how they are to this day. In addition‚ in the relationship there has been an increase of relational dialectical tensions that can be challenging but ultimately can be worked on for improvement. The rewards‚ costs‚ and dialectical tensions can all be considered when assessing my current relationship. As the text reads‚ immediate rewards and cost
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Database Environment Paper DBM-380 November 18‚ 2012 Introduction A database defines a structure for storing information and it collects information that is organized in such a way that a computer program can quickly select desired pieces of data. A database can also be thought of as an electronic filing system. Data and information are extracted from a database by creating a query and then submitting it to the query database management system (DBMS) and it is posed in a language that
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Relational Cultural Theory Introduction Relational cultural theory refers to a branch of psychology that deals with human relations. The theory states that it is important for society to sustain relationships that promote growth (Walker‚ 2004). According to the theory‚ growth applies if people create inclusive relationships that support joint success rather than individual autonomy and disconnection from society. In addition‚ relational cultural theory singles out individual isolation as the origin
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Innovations in Practice Volume 9‚ 2010 Database Security: What Students Need to Know Meg Coffin Murray Kennesaw State University‚ Kennesaw‚ GA‚ USA mcmurray@kennesaw.edu Executive Summary Database security is a growing concern evidenced by an increase in the number of reported incidents of loss of or unauthorized exposure to sensitive data. As the amount of data collected‚ retained and shared electronically expands‚ so does the need to understand database security. The Defense Information Systems
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the patient. In this scenario between Michael Grigio‚ the patient‚ and his family (See Appendix A) there are several factors that affect how to resolve the situation at hand. Relational ethics can be used as a guide to assist the family with determining a decision that will primarily respect the patient’s autonomy. Relational ethics centers on the notion that moral good and happiness of a person is rooted in our relationships with others (MacDonald‚ 2006). It has a strong emphasis on an authentic
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The Relational Approach to Counselling I this essay I intend to demonstrate my understanding of the Relational Approach and its underlying theory. I will show throughout this essay that it is essential to understand relationships‚ their development and impact on humans. I am also going to discuss the concept of secure base and repeating relational patterns. I will then consider the implications of working with a culturally diverse population and how this effect the counsellor‘s way of being with
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The entity-relationship model (or ER model) is a way of graphically representing the logical relationships of entities (or objects) in order to create a database. entity type is a collection of entity instances sharing similar properties Strong Entity Vs Weak Entity An entity set that does not have sufficient attributes to form a primary key is termed as a weak entity set. An entity set that has a primary key is termed as strong entity set. A weak entity is existence dependent. That is the
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