More about Databases. Topics. More Taxonomy. And more Taxonomy. Computer Literacy 1 Lecture 18 30/10/2008
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1 Topics More about Databases Computer Literacy Lecture 8 30/0/008 Terminology What s a database for again? Relational Database Model Samples Database Integrity Data mining More Taxonomy According to more orthodox database terminology a file is a collection of recordings A record is the information relating to a single item of the relevant type, e.g. person, product, event In an address book database, a record contains information about person, a CD catalogue would have record per CD And more Taxonomy Each discrete chunk of information in a record is called a field The type of information a field can hold is determined by its field type or data type For example the author in a library database would be a text field, the field for specifying the number of copies would be a numeric field
2 Other fields A date of purchase field might be a date field that only allows dates to be entered Many database programs allow fields to contain graphics, photographs, sounds, video clips Computed fields contain formulas similar to spreadsheet formulas: They display values calculated from other numeric fields Layers Recall layers of abstraction architecture: Physical, logical, external The abstract logical layer is the heart of the database since this is where the data structures live What is a database for Ultimately, the point of a database is to model part of the real world So we want the data structures to represent the corresponding area/realm of facts The realm of facts is a complex place: objects have many different attributes and bear many different relationships with each other The model should accurately express these attributes and relationships Different Types There are various methods for structuring the data to represent the facts, e.g. flat files, hierarchies, networks, object oriented models Our focus will be on relational model - currently most wide spread
3 Different Types The DBMS transforms data in the physical data files into a common structure in the logical layer (schema) Different data structures are generated by different DBMSs What s a database again? Structure - Schema Data Within the structure we can define classes of items, their properties and the relationship between them Data is then entered into the database to conform the schema You can have a schema with no data Database vs. DBMS A database is a schema plus data The program that lets you work with the data is a Data Base Management System (DBMS) MS Access are DBMSs, not databases Relational Database Model Developed by E.F. Codd, 970 Only one basic structure in RDB: the relation The relation is a table of objects of the same type With properties: Every relation must have a unique name Every column in it must have a unique name Duplicate rows are not allowed Enforced by a requiring a unique primary key Each cell must contain a single value 3
4 Example - Structure Example Data Schema: Media catalogue Instance: My Music Collection Classes: Artists, Work Relationship: Artists record work etc Attributes: Artists have names, category, nationality, Works have titles, dates, media, Artists: Eels Kings of Leon Works Beautiful Freak Only by the night Relationships The Eels recorded Beautiful Freak Attributes Beautiful Freak was recorded in 996 on CD Database Integrity Consider: Only by the night Kings of Leon Only by the night King of Leon Aha Shake Heartbreak King of Leon Variations produce inauthentic duplication and lack of association (a search on Kings of Leon would miss Aha Shake Heartbreak) This database is not an accurate reflection of the world it represents: it lacks integrity Relational Database Database comprises a set of tables, where all the data on one topic is stored in a table A record is the data for a for a single item in a table, e.g. the details relating to one artist A field is a piece of data within a record, e.g. album title A relationship links detail in one table with detail in another, e.g. through a ArtistID number 4
5 Tables Each record in a table is presented in a row Each field in a record is in a column Each field has a field name at the top of the column The type of information a field can hold is determined by its field type, e.g. text field, numeric field, etc Keys Most records will have a unique identifier - a field that holds different information in every record The field that must be unique in each record is the Primary Key - you can t enter duplicate information in a primary key field A Foreign Key refers to a Primary Key in another table Sample Relations Primary Key AlbumID Album Title ArtistID Foreign Key Join Albums with Artists (Natural) join of Album and Artists 3 Beatiful Freak Only by the night Aha Shake Heartbreak AlbumID Title Beautiful Freak ArtistID ArtistName Eels ArtistType ArtistID ArtistName Eels ArtistType 3 Only by the Night Aha Shake Heartbreak Kings of Leon Kings of Leon Kings of Leon 5
6 A Few Relational Operators The External Layer Restrict Returns selected rows according to criteria Project Returns selected columns according to criteria Join Returns one relation from (more columns) Union Merge compatible relations (more rows) Intersection Returns rows common to relations Uses a query language, e.g. SQL (also handles schema definition) based on relational operators Input via direct entry into a table or via a form Query as text enquiry or via GUI Output as response to a query A user view Data Mining Discovery of hidden/unexpected patterns of data A.K.A. Knowledge Discovery Involves large volumes of data Process of sorting through large amount of data and picking out relevant information Useful in making organisational decisions Data Mining Techniques Predictive modelling Test model against real data Or train your model on a sample data set Segmentation Look for clustering in data Buying patterns 6
7 Key points Terms: Schema, relations, DBMS Relational Model and how it is applied Database integrity Selected operators and what they do Data mining 7
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