relationships between those entities. Example 7. Crow’s Foot ER Diagram - A graph/ diagram that represents the conceptual database as viewed by the end user. Example 8. ERM Components - Summarizes the ERM’s components and names the entities and their relations. Example. . 9. Data Dictionary - Provides detailed accounting of all tables found within the user/designer-created database - Contains (at least) all the attribute names and characteristics for each table in the system - Contains metadata—data
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1. a) What is a database? A database is an organized collection of related data. b) How does an RDBMS store data? An RDBMS stores related data in tables. 2. What is one benefit of dividing data into tables? Dividing data into tables eliminates unnecessary data duplication, or data redundancy. 3. a) What is a database schema? A database schema is a description of the data and the organization of the data
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ranow, E. B. “Developing Good Data Definitions.” Database Programming & Design 2 (8) (1989): 36–39. Booch, G. Object-Oriented Analysis and Design with Applications. 2d ed. Redwood City, CA: Benjamin Cummings, 1994. Bruce, T. A. Designing Quality Databases with IDEF1X Information Models. New York: Dorset House, 1992. Chen, P. P-S. “The Entity-Relationship Model—Toward a Unified View of Data.” ACM Transactions on Database Systems 1 (March 1976): 9–36. Codd, E. F. “A Relational Model of Data
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1. List the advantages of a relational model specific to ACME Global Consulting. Relational models can provide some very significant advantages over other methods. First, they are very easy to read due to the nature of two-dimensional tables. Columns and row format is straightforward and consists of a collection of similar data among rows that allow for the user to easily locate what they need. One of the biggest advantages of the relational model of database design is that its foundation is
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take one or more relations as input and produce a new relation as a result. The fundamental operations of relational algebra are select, project, union, set difference, Cartesian product and rename. Other operations are: Set intersection, natural join, division and assignment. • The basic set of operations for the relational model is known as the relational algebra. These operations enable a user to specify basic retrieval requests. • The result of retrieval is a new relation, which may have
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OLAP In computing, online analytical processing, or OLAP ( /ˈoʊlæp/), is an approach to answering multi-dimensional analytical (MDA) queries swiftly.[1] OLAP is part of the broader category of business intelligence, which also encompasses relational database report writing and data mining.[2] Typical applications of OLAP include business reporting for sales, marketing, management reporting, business process management (BPM),[3] budgeting and forecasting, financial reporting and similar areas,
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1. We have structure pane and class n object pane in UDT, in IDT, they have Data foundation layer (in stead of structure pane) and Business Layer (instead of Class n object pane). First of all, a project is created, then a relational or OLAP connection, then data foundation and then business layer. Then the universe is published as .unx 2. In IDT, the biggest advantage is that you have create universe based on multiple data sources. It could be different relational data sources (must be 64-bit)
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* How the Internet works * Packet-switching technology Actual data transmission takes place sporadically, rather than continuously. Data to be transmitted is divided into small packets of information and labeled to identify the sender and recipient. These are sent over a network and then reassembled at their destination. If any packet did not arrive or was not intact, original sender requested to resend the packet. -> This enables millions to transmit data at the same time. * Understand
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cursor is a variable that runs through the tuples of some relation. This relation can be a stored table, or it can be the answer to some query. By fetching into the cursor each tuple of the relation, we can write a program to read and process the value of each such tuple. If the relation is stored, we can also update or delete the tuple at the current cursor position. The example below illustrates a cursor loop. It uses our example relation T1(e,f) whose tuples are pairs of integers. The program will
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Arab Academy for Science, Technology and Maritime Transport College of Engineering and Technology Industrial and Management Engineering Department Course: IM433 – Industrial Database Systems Management Student Name: | Department: | Student Number: | Sheet #1 Given the following file structure, answer problems 1 through 6. 1. How many records does the file contain, and how many fields are there per record? 2. What problem would you encounter if you wanted to produce a listing
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