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Database Terminology

Database Terminology. Business Application Development. DB Terminology. Database Often abbreviated DB . A collection of information organized in such a way that a computer program can quickly select desired pieces of data. DBMS Database Management System

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Database Terminology

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  1. Database Terminology Business Application Development

  2. DB Terminology • Database • Often abbreviated DB. A collection of information organized in such a way that a computer program can quickly select desired pieces of data. • DBMS • Database Management System • A collection of programs that enables you to store, modify, and extract information from a database.

  3. DB Terminology • RDBMS • Relational Database Management System • A type of DBMS that stores data in the form of related tables. • Powerful because they require few assumptions about how data is related or how it will be extracted from the database. • The same database can be viewed in many different ways. • Table • A collection of data that relates to each other

  4. DB Terminology • Record • A complete set of information. Records are composed of fields, each of which contains one item of information. • Also called a tuple • Field • A space allocated for a particular item of information. • The smallest units of information you can access.

  5. DB Terminology • Data • Distinct pieces of information, usually formatted in a special way. • Metadata • Data about data. • Describes how and when and by whom a particular set of data was collected, and how the data is formatted. • Attribute • A particular piece of information about a field

  6. DB Design • Student Database

  7. DB Terminology • SQL • Structured Query Language • Standardized query language for requesting information from a database. • Normalization • The process of organizing data to minimize redundancy

  8. DB Terminology • First Normal Form • Each field in a table contains different information. For example, in an employee list, each table would contain only one birth date field. • Second Normal Form • Each field in a table that is not a determiner of the contents of another field must itself be a function of the other fields in the table. • Third Normal Form • No duplicate information is permitted.

  9. DB Design • Normalize our database

  10. DB Terminology • Trigger • A procedure that initiates an action when an event (INSERT, DELETE or UPDATE) occurs. • Stored in and managed by the DBMS. • Cannot be called or executed; the DBMS automatically fires the trigger as a result of a data modification to the associated table. • Triggers are used to maintain the referential integrity of data by changing the data in a systematic fashion.

  11. DB Terminology • Key • A field that you use to sort data. It can also be called a key field , sort key, index, or key word. • Foreign Key • A key field that identifies records in a different table

  12. DB Terminology Questions?

  13. DB Design • Assign Key’s to our Student DB • Create a gaming DB

  14. Database assignment • Lawn Care Company • Technical Equipment • Conference Sports Teams • School’s Extra-curricular Activities • Library program • Student computers/internet • Video Rental System • Role playing game • Racing game

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