Answerd question:'ExplainDate:2015-04-13 00:18:57
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Answerd question:'DefineDate:2015-04-13 00:01:48
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We can create a database view that contains information stored in more than one database. We do this using a special type of field called a database relation, which allows you to join two databases together. Characteristics of Relation: 1. Attribute Values are Atomic 2. Tuples are unordered The order of rows in a relation is immaterial. 3. Attributes are unordered The order of columns in a relation is immaterial. 4. No Duplicate Tuples A relation cannot contain two or more tuples which have the same values for all the attributes. i.e., In any relation, every row is unique.Date:2015-04-12 23:58:04