7th Edition Notes
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: | A self-describing collection of integrated records
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| Record: | A representation of some physical or conceptual object
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| Metadata: | The data the describes the data's structure within a database; structural data
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| Integrated Data: | Data that includes not only data items but also the relationships among data items
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| Data Dictionary: | Metadata stored in an area of data which describes the tables, columns, indexes, constraints, and other items that make up a database
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| DBMS: | Database management system
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| DBMS description: | A set of programs used to define, administer, and process databases and their associated applications.
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| SAN: | Storage Area Network - storing daa on the Internet
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| Flat Files: | Data files with minimum structure; a collection of data records, one after another, in a specified format
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| The three database models: | Hierarchical, Network, and Relational
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| Hierarchical Database: | These databases arrange their data in a simple hierarchical structure that allows fast access.They suffer from redundancy problems
and their structural inflexibility makes database modification difficult.
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| Network Database: | Network databases have minimal redundancy but have structural complexity
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| Relational Database: | These databases store their data in tables that are related to each other.
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| Enterprise Databases: | Databases built according to the hierarchical or network model.
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| SQL applies only to which database model? | Relational databases / Object-relational databases
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| Relation: | A 2D array of rows and columns, containing single-valued entries and no duplicate rows. Each cell in an array can have only one value and no two rows may be identical
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| View: | A subset of a database that an application can process AKA virtual tables
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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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