Lesson 6 Databases and Web Search Engines
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| • Database | – an organized collection of information that pertains to a particular subject or purpose
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| o Table | – a collection of data about a specific topic, organized into columns and rows
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| o Field | – a category of information in a table (a column)
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| o Record | – a collection of information consisting of one or more related fields about a specific entity (a row)
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| • Relational database | – a database that contains multiple tables related through common fields
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| o Common field | – a field, contained in two or more tables, that forms a relationship between the tables
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| o Relationship | – a connection between two or more tables based on a common field
o Relating tables eliminates the duplication of data
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| o The common field | is the primary key in one table and the foreign key in another table
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| Primary key | – a field containing a value that uniquely identifies each record in a table
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| Foreign key | – a field in a related table that refers to the primary key in another table
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| • Query databases using: | o Menu queries (drop-down menu)
o Query by example (keyword search)
o Query languages, such as SQL (customized search)
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| o Search engine | – uses a robot or spider program to browse the Web following hyperlinks, and index the content that it finds
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| o Information portal | – only finds Web sites based on manual submissions
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| • Boolean operators | – symbols or words used to narrow Internet search results by including or excluding certain words or phrases from the results
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| o Popular | – generally bases information on secondary resources
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| o Scholarly | – bases its research on primary resources
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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