• Home Page
  • What Is Relational Database Constraints?

What Is Relational Database Constraints?

Great Essays
Show More
[pic][pic]
[pic]2

RELATIONAL MODEL: CONCEPTS, CONSTRAINTS, LANGUAGES, DESIGN, AND PROGRAMMING

[pic][pic][pic][pic][pic][pic][pic][pic][pic][pic]
[pic]5

The Relational Data Model and Relational Database Constraints

This chapter opens Part II of the book on relational databases. The relational model was first introduced by Ted Codd of IBM Research in 1970 in a classic research publication "System R4 Relational." (Codd 1970), and attracted immediate attention due to its simplicity, practicality, and mathematical foundation. The model uses the concept of a mathematical relation—which looks somewhat like a table of values—as its basic building block, and has its theoretical basis in set theory and first-order predicate logic. This …show more content…
Since then, the model has been implemented in a large number of commercial systems. Current popular relational DBMSs (RDBMSs) include DB2 and Informix Dynamic Server (from IBM), Oracle and Rdb (from Oracle), and SQL Server and Access (from Microsoft). Some other commercial relational DBMSs used are Sybase (also known as Sybase SQL Server), Paradox, and Foxbase. Recently, some open source relational DBMSs, such as MySQL and PostGreSQL have also grown in popularity. At the time this chapter was written, the market share varied depending on platform; with DB2, Oracle, and Microsoft SQL Server dominating the market overall. [Note to editor: Would you like to include TM symbol in all trademarks? Also the small caps formatting, such as SQL and SQL can be made consistent. Personally, I prefer SQL over SQL but am flexible]. Oracle dominates the market in the UNIX world followed by DB2, whereas Microsoft SQL Server dominates the Windows platform market with Oracle coming in second. [Note to editor: this will need to be updated at the time the book goes to

Related Documents

  • Superior Essays

    Porter's Five Forces Analysis Paper
    • 955 Words
    • 4 Pages

    Porter's Five Forces Analysis Paper

    But, despite that fact, Apple has maintained a large share of the computer market. “In September of 2009, according to market researcher NPD Group, Macs accounted for 18.9% of all laptops and desktops sold in U.S. retail outlets. For computers priced above $1,000, Apple 's share was an astonishing 89% (Wildstrom).” Hewlett-Packard and Dell have adopted some of Apple’s computer styling to attract Apple’s high-end customers in addition maintaining lower cost alternatives. Since Apple offers a unique product, the greater rivalry is among Windows based desktop computer companies. Customer service is another rivalry among desktop computer companies.…

    • 955 Words
    • 4 Pages
    Superior Essays
    Read More
  • Great Essays

    Path Dependency Essay
    • 1420 Words
    • 6 Pages

    Path Dependency Essay

    For example, take two operation softwares and compare their connection to their surroundings. On the one hand, Bill Gates’ Microsoft with its Windows system. Although not being the first operating systems with a graphical user interface it replaced the MS-DOS systems used in businesses in the US. Through different updates and new releases, Windows improved their user friendliness and enabled a wider range of people to work with a computer. Due to the compatibility with other software, several gaming software producer jumped on the bandwagon and made their products available on Windows.…

    • 1420 Words
    • 6 Pages
    Great Essays
    Read More
  • Great Essays

    Relational Storage Structure
    • 1897 Words
    • 8 Pages

    Relational Storage Structure

    PROFILE OF ORACLE CORPORATION Oracle Corporation is the world's leading supplier of software for information management and the largest database software company which is headquartered in Redwood City, California, United States. The company offers its database, tools and application productsin more than 145 countries around the world and the second global revenue after Microsoft in year 2013. The product such as Middleware,Oracle Beehive, and Oracle Database bring a large changing in the lifestyle of human and system operation of job. It employs 21,000 based in the US while 22,0001outside the US. Identifying relational databases, as a great business opportunity is one of several brilliant moves Ellison made over his career.…

    • 1897 Words
    • 8 Pages
    Great Essays
    Read More
  • Improved Essays

    Microsft Success Story Essay
    • 1049 Words
    • 5 Pages

    Microsft Success Story Essay

    Microsft Success Story – Satya Nadella as CEO Microsoft Corporation is one of the giant in software industry with headquarters in Redmond, Washington. Bill gates and Paul Allen are the core founders of Microsoft Corporation. The company manufactures, develops, licenses, supports and services. The major part of business involves computer software, personal computers and consumer electronics. The best and well known products of the company are the Microsoft Windows line of Operating Systems (OS), the Microsoft Office suite (Office), and the Internet Explorer (IE) as web browsers.…

    • 1049 Words
    • 5 Pages
    Improved Essays
    Read More
  • Improved Essays

    Digital Forensic Essay
    • 790 Words
    • 4 Pages

    Digital Forensic Essay

    There are many cases that made use of computer forensic, such as Corey Beantee Melton’case in 2005. Another import branch is mobile device forensic, one famous case is the Brad Cooper in 2008. For both computer and mobile device forensic, they deal with logs such as browser history, email history, call log, and actual file in the device, like pictures and videos. For now, most important files are extracted from computers, however, as Danyl Bosomworth pointed out in his report about mobile marketing, smart phones are getting more and more usage comparing to computers, moreover, nowadays, any $300 worth smart phone is powerful enough for daily use, combining with cloud and internet, people are more likely to put personal data such as pictures, calendars or chat logs in their smart phones due to the easiness and convenience to use, which makes this mobile device forensic more and more important. The rest of digital forensics’ branches are network forensics, database forensic, forensic data analysis.…

    • 790 Words
    • 4 Pages
    Improved Essays
    Read More
  • Great Essays

    Amazon: Key Problems/Issue Of The Case
    • 1308 Words
    • 6 Pages

    Amazon: Key Problems/Issue Of The Case

    Key Problems/Issue of the Case Jeffrey Bezos started Amazon in 1994, in Seattle, Washington, and launched Amazon.com in July 1995. Bezos chose Seattle as Amazon’s headquarters because of the lack of sales tax, technology cluster, and its proximity to the largest book wholesaler, Ingram. Amazon started out by selling books but later developed into an online retail department store, offering a large range of products. The company also served as a third-party marketplace where other individuals and businesses could sell their items. Amazon quickly expanded as the concept caught on, and people could compare prices and buy a variety of product offerings from a single website.…

    • 1308 Words
    • 6 Pages
    Great Essays
    Read More
  • Superior Essays

    Characteristics Of Creating An Oracle Database
    • 2355 Words
    • 10 Pages

    Characteristics Of Creating An Oracle Database

    With memory and central processing unit (CPU) they are discussing the different processors and Random Access Memory (RAM) and how that can limit the speed of the database being called upon. With just about anything to with computer Oracle does have server minimum hardware and memory requirements and it is very basic but this is just the minimum when you should if needed go above and beyond the minimum requirements. Oracle asks for a minimum of 4 gigabytes of Random Access Memory, and a central processing unit technology that has been available since 2006. This architecture is old even for servers and you could do better and reduce the bottlenecking from the central processing unit side. When talking about server Random Access Memory you need to make sure the server is optimized with the available resources of the machine.…

    • 2355 Words
    • 10 Pages
    Superior Essays
    Read More
  • Improved Essays

    Compare And Contrast Bill Gates And Steve Jobs
    • 947 Words
    • 4 Pages

    Compare And Contrast Bill Gates And Steve Jobs

    However, increasingly, there developed many IBM PC clones; (PCs developed by other companies compatible with IBM’s). Microsoft worked hard to sell its operating system to these other companies. Thus Microsoft was able to gain the dominant position of software manufacture just as the personal computer market started to boom. Since its early dominance, no other company has come close to displacing Microsoft as the dominant provider of computer operating software.In 1990 Microsoft released its first version of Windows. This was a break through in operating software as it replaced text interfaces with graphical interfaces.…

    • 947 Words
    • 4 Pages
    Improved Essays
    Read More
  • Improved Essays

    Industry And Achieve Competitive Advantage
    • 777 Words
    • 4 Pages

    Industry And Achieve Competitive Advantage

    As I mentioned above the retail industry has benefitted greatly from new technology. Retail is a dynamic industry with its own set of multifaceted and diverse business processes and requirements. Retailers today are challenged with addressing multiple disruptive technologies and the demanding “Digital Customer” who likes to order other products and services using more than one touch points at their convenience of location and device. (Firstpost, 2014) Debenhams is Britain’s second largest department store and has 240 stores and over 24000 employees in 28 stores across the U.K. and Ireland. Debenhams offers online services to customers including online shopping, click and collect and also kiosks instore.…

    • 777 Words
    • 4 Pages
    Improved Essays
    Read More
  • Great Essays

    Michael Dell's Model Of E-Marketing Strategy In The Dell Company
    • 2174 Words
    • 9 Pages

    Michael Dell's Model Of E-Marketing Strategy In The Dell Company

    One of them is that, it bypasses retailers and distributors which eliminate the markup profit of the resellers and secondly, it helps Dell to avoid the inventory heavy inventory costs that are required to stick all the manufactured products. Dell believes that its model of e-business policy is applicable everywhere, anywhere and for any customer. Dell has witnessed remarkable success in a short period of time by choosing a strategy of direct business to customer form. Looking at its history, it began selling online in 1996, by 1999 it became the largest manufacturer of computers in industry, its name was changed to Dell Inc. in 2003, CEO Michael Dell resigned from his position in 2003 and again gained back his position in 2007. Therefore in 1992, Dell became successful in putting its name in the list Fortune 500 companies and establishing itself as one of the largest companies in the world.…

    • 2174 Words
    • 9 Pages
    Great Essays
    Read More

Related Topics

Ready To Get Started?
Discover
Company
Follow
©2023 Cram.com
Privacy Policy |  CA Privacy Policy |  Site Map |  Advertise  | 
  • Cookie Settings