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
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Oracle Table Triggers Version 11.1 General Data Dictionary Views Related To DDL Triggers trigger$ dba_triggers all_triggers user_triggers System Privileges Related To Table Triggers create trigger create any trigger administer database trigger alter any trigger drop any trigger Table Trigger Firing Options -- before constraints are applied BEFORE INSERT BEFORE UPDATE BEFORE DELETE -- after constraints are applied AFTER INSERT AFTER UPDATE AFTER DELETE Transaction
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Word Count: 304 words 1. Table: Similar to spreadsheet used to store data. 2. Queries: Method of extracting specific data 3. Forms: Element to modify and insert records into you databases 4. Reports: It contains raw data and allows the organization of information in an easy way. 5. Databases: collection of associated information 6. Relational databases: access databases in which more than one can share information. 7. Record: each row in a table. 8. Data Value: an item such as data‚ or such
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Running Head: Database Development Case Study: Database Development Maintenance plans and activities that could be performed in order to improve data quality In order to improve the quality of datasets various activities to be performed like error detection and correlation‚ process design and process control and improvement In error detection method‚ errors are detected by comparing data to a correct baseline and by checking for missing values. By examining time stamp incorrected
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to real-time database management systems to be used in such control-systems. By integrating a real-time database management system into a vehicle control-system‚ data management on a higher level of abstraction can be achieved. Current database management concepts are not sufficient for use in vehicles‚ and new concepts are necessary. A case-study at Volvo Construction Equipment Components AB in Eskilstuna‚ Sweden presented in this thesis‚ together with a survey of existing database platforms confirms
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What problem would you encounter if you wanted to produce a listing by city? How would you solve this problem by altering the file structure? Some of the project managers are mentioned several times‚ that would cause duplication in the city database. 3. If you wanted to produce a listing of the file contents by last name‚ area code‚ city‚ state‚ or zip code‚ how would you alter the file structure? Divide address capabilities‚ by dividing MANAGER_ADDRESS into its component parts (MGR_STREET
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shoping behaviour?( to aggregate)” or “What are other products or services sold with credit card ?( to associate ) can be answered. Basket analysis aims to find pozitive and negative correlation between sold products. If an example is given ‚the research which was reconnoitred by TESCO one the biggiest supermarket of U.K‚ have to be the first minded. In Tesco’s diapers and beers are sold together on the same stands on Fridays. Diaper and beer. The reason is very simple. At weekends while English
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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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Anna Nicole Smith (born Vickie Lynn Hogan) (November 28‚ 1967 – February 8‚ 2007)‚ was an American model‚ actress‚ and television personality. Smith first gained popularity in Playboy‚ becoming the 1993 Playmate of the Year. She modeled for clothing companies‚ including Guess jeans and Lane Bryant. Smith dropped out of high school at age 15 and was married in 1985. Her highly publicized second marriage to oil business mogul‚ J. Howard Marshall‚ 62 years her senior‚ resulted in speculation that
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2.5 Database 2.5.1 Introduction A database is a collection of information that is organized so that it can easily be accessed‚ managed‚ and updated. Databases in particular can form a key part of an information management plan which can support researchers and facilitate data management throughout the research lifecycle. Database technology can assist data at the collection stage by providing customized ways to input data‚ and the ability to do so from different locations such as five different
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