OrderInvoiceDetail is the table’s name here. **Make sure that your 2nd table will have a composite primary key – primary key from the 1st table will be brought to the 2nd table as a link of reference. Composite primary key – primary key that is made up to two keys. 3rd STEP: 2NF (Second Normal Form) – Remove Partial Dependency Partial Dependency – dependency of attributes to only half portion of the primary key. To be in 2NF‚ all attributes must be fully dependent on the entire set of primary key (which
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Files and Relational Databases What is a file? • contains groups of records used to provide information for operations‚ planning‚ management and decision making. • can be used for storing data for an indefinite period of time‚ or they can be used to store data temporarily for a specific purpose. FILE TYPES • Master Files -- contain records for a group of entities. The attributes may be updated often‚ but the records themselves are relatively permanent. These files
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Comparing and Contrasting the Relational Database Model and OO Model The relational database model is based upon tables or relations. In this model‚ the physical implementation of the database is abstracted away from the user. Users query the database using a high-level query language‚ such as SQL. The relations are made up of columns‚ which have headings indicating the attribute represented by that column. Tables have key fields‚ which can be used to identify unique records. Keys relate tables
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Tale of Two... If you’re looking for a way to get rid of Monday‚ you should just call it Friday. He/she knows what to do because Friday is way less productive than Monday. On Mondays‚ everyone is really tired and that is not an opinion. About more than 39% of people dread waking up to go to either work or school. My mom drinks so much more coffee on Mondays to help her stay awake so she can get us to school. Some people feel that they get less sleep on other weekdays and they aren’t even tired.
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Questions Indicate whether the following statements are true or false on the student answer sheet. 1) A requirement is something a database needs to do in order to fulfill its purpose. True 2) You only need to include the most important stakeholders in the database discussions. False 3) Forms are used for gathering input. True 4) A transaction database is optimized to track transactions in real time. True 5) Data mining uses business intelligence tools and techniques on
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something a database needs to do in order to fulfill its purpose. 2. FALSE You only need to include the most important stakeholders in the database discussions. 3. TRUE Forms are used for gathering input. 4. TRUE A transaction database is optimized to track transactions in real time. 5. TRUE Data mining uses business intelligence tools and techniques on a variety of data sources brought together in a data warehouses. 6. TRUE The domain is the focus or knowledge area of a database.
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EXPERIMENT NO 2 FACT TABLE FOR UNIVERSITY DATABASE AIM:-Creation of dimension table and fact table for University Database. THEORY:- DIMENSION TABLE In data warehousing‚ a dimension table is one of the set of companion tables to a fact table. The fact table contains business facts or measures and foreign keys which refer to candidate keys (normally primary keys) in the dimension tables. Contrary to fact tables‚ the dimension tables contain descriptive attributes (or fields) which are typically
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August 4‚ 2009 What is Database Normalization? Database Normalization is a systematic way of ensuring that a database structure is suitable for general – purpose quering and normalization is the process of efficently organizing data in a database. This process was first introduced in 1970 by E.F. Codd and has since been redefined to higher normal forms. The two goals of the normalization process are: eliminating redundant data and ensuring that data dependencies make sense. These goals reduce
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UNIVERSITY OF MARYLAND UNIVERSITY COLLEGE Business Law I‚ BMGT 380 Midterm Examination This midterm examination is open book‚ open notes‚ but you are on the honor system not to seek assistance from anyone to complete this exam. There are 25 multiple choice questions worth 2 points each and 10 essay questions worth 5 points each‚ for a total of 100 points. Answer all the questions because for the essays partial credit is given where appropriate. Just submit the question number and your answer
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MMIS 630 Database Systems – Final Exam 1. What are the issues in the normalization vs. performance trade-off? Discuss. Your essay should (1) define and describe the characteristics of normalization‚ (2) define and describe the characteristics of performance‚ and (3) define and describe what is meant by “performance trade-off”‚ (4) summarize your essay with recommendations and/or guidelines regarding use of normalization in database design. ANS: When we take a close look in designing
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