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Lesson 6 Databases and Web Search Engines

• Database – an organized collection of information that pertains to a particular subject or purpose
o Table – a collection of data about a specific topic, organized into columns and rows
o Field – a category of information in a table (a column)
o Record – a collection of information consisting of one or more related fields about a specific entity (a row)
• Relational database – a database that contains multiple tables related through common fields
o Common field – a field, contained in two or more tables, that forms a relationship between the tables
o Relationship – a connection between two or more tables based on a common field o Relating tables eliminates the duplication of data
o The common field is the primary key in one table and the foreign key in another table
 Primary key – a field containing a value that uniquely identifies each record in a table
 Foreign key – a field in a related table that refers to the primary key in another table
• Query databases using: o Menu queries (drop-down menu) o Query by example (keyword search) o Query languages, such as SQL (customized search)
o Search engine – uses a robot or spider program to browse the Web following hyperlinks, and index the content that it finds
o Information portal – only finds Web sites based on manual submissions
• Boolean operators – symbols or words used to narrow Internet search results by including or excluding certain words or phrases from the results
o Popular – generally bases information on secondary resources
o Scholarly – bases its research on primary resources
Created by: spearaylall