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INLS 623– Database Systems II

INLS 623– Database Systems II. Instructor: Dr. Carter. Database Management System. Database: Logically Coherent Collection of related data. Types of Database Systems. Relational Graph Object-oriented. Relational Database Systems in Wide Use.

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INLS 623– Database Systems II

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  1. INLS 623– Database Systems II Instructor: Dr. Carter

  2. Database Management System • Database: Logically Coherent Collection of related data

  3. Types of Database Systems • Relational • Graph • Object-oriented

  4. Relational Database Systems in Wide Use • Three Major Database Management Systems in wide use • Oracle - Large, commercial, enterprise-scale, very verytweakable • MySql - Simpler but very fast and scalable - commercial open source • SqlServer - Very nice - from Microsoft (also Access) • Postgres – Open source, enterprise scale • SQLite – Very small, mostly used for one user

  5. Relational Database • Review • What is an Entity? An object of interest with properties or attributes Give some examples of entities? University domain: student, lecturer, course, grade, room, facility, year-of-study, major, department, …

  6. Entities Have Properties • Properties have types • Types: number, string, blob In a relationalDBMS, how do we represent entities?

  7. Represent Entities as Tables • Store data in rows and columns • All tables have a name • Each column in the table has: • A name (property) • A type • Each row is a record • Records contain the data

  8. Tables Columns Table Name: People Rows Tables can be related to one another

  9. Relationships • A constraint between two entities • Examples? • Each student has one grade per course • A student can take multiple courses • Types of relationships • one-to-one • many-to-one • many-to-many

  10. Types of Relationships

  11. Keys: More Constraints • Primary Key • Secondary Key(s) • Candidate Key(s) • Foreign Key(s)

  12. Primary Key Constraint • Uniquely identifies each record in a database table. • Primary keys must contain unique values. • A primary key column cannot contain NULL values. • Most tables should have a primary key, and each table can have only ONE primary key.

  13. Secondary and Candidate Keys • Sometimes there are more than one key for a relation. • Database Administrator chooses the primary key. • The other keys are called secondary keys. • The secondary and primary keys are called candidate keys.

  14. Foreign Keys • Capture relationships across entities(tables). • A FOREIGN KEY in one table points to a PRIMARY KEY in another table.

  15. Topics We will Cover • Review • Database Design • Normal Form • Database Indexing • Database Tuning • Triggers • XML • Database development on the Internet • Non-relational databases

  16. Mysql • Mysql • http://dev.mysql.com/downloads/ • MySQL Community Server • Mysql Workbench • Visual tool to manager mysql databases • http://dev.mysql.com/downloads/workbench/

  17. Resources • http://www.w3schools.com/sql/

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