Datamining And Security

Essay specific features

 

Issue:

Technology

 

Written by:

David A

 

Date added:

June 23, 2013

 

Level:

University

 

Grade:

A

 

No of pages / words:

4 / 928

 

Was viewed:

3624 times

 

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Essay content:

A table can have one or more columns. A column is made up of a column name and a data type, and it describes an attribute of the tuples. The structure of a table, also called relation schema, thus is de?ned by its attributes. The type of information to be stored in a table is de?ned by the data types of the attributes at table creation time...
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In this tutorial we will use the terms interchangeably. A table can have up to 254 columns which may have di?erent or same data types and sets of values (domains), respectively. Possible domains are alphanumeric data (strings), numbers and date formats. Oracle o?ers the following basic data types: • char(n): Fixed-length character data (string), n characters long...
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