Date:2015-04-13 00:18:57Answerd question:'Write
Date:2015-04-13 00:18:28Answerd question:'What
Date:2015-04-13 00:17:34Answerd question:'Explain
Date:2015-04-13 00:16:37Answerd question:'.
Date:2015-04-13 00:15:17Answerd question:'What
Date:2015-04-13 00:14:40Answerd question:'Distinguish
Date:2015-04-13 00:13:51Answerd question:'Explain
Date:2015-04-13 00:12:45Answerd question:'Briefly
Date:2015-04-13 00:12:12Answerd question:'Write
Date:2015-04-13 00:11:24Answerd question:'Explain
Date:2015-04-13 00:10:45Answerd question:'explain
Date:2015-04-13 00:09:18Answerd question:'What
Date:2015-04-13 00:08:37Answerd question:'Explain
Date:2015-04-13 00:07:05Answerd question:'What
Date:2015-04-13 00:06:10Answerd question:'Breifly
Date:2015-04-13 00:03:45Answerd question:'Explain
Date:2015-04-13 00:02:46Answerd question:'Define
Date:2015-04-13 00:01:48Answerd question:'Explain:
Date:2015-04-13 00:00:25We 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.