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What is join dependency and inclusion dependency?
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Join Dependency:

A Join dependency is generalization of Multivalued dependency.A JD {R1, R2, ..., Rn} is said to hold over a relation R if R1, R2, R3, ..., Rn is a lossless-join decomposition of R . There is no set of sound and complete inference rules for JD.

Inclusion Dependency:

An Inclusion Dependency is a statement of the form that some columns of a relation are contained in other columns. A foreign key constraint is an example of inclusion dependency.
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basically we use joins to query a sql with 1 or more tables.
1) self join.. join within the same table using aliases
2) equi join.. join between the 2 tables with commom columns
3) outer join.. and it is divided into 2 catagories left  outer join and right outer join.

View :- its a logical representation of one or more tables.View doesn't have the data of its own. But still you 
            can perform DML on a view ..the changes will be done in the underlying base tables.
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Sunday, March 09, 2008
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Monday, September 24, 2007
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Comments (2) :
1.
dk123
Wednesday, March 19, 2008 6:27 AM
nice comment
2.
thingMaster
Tuesday, October 23, 2007 1:52 PM
you are overconfident. you will probably kill many patients, but drive a nice car.
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different types of joins are
equi join
non equi joiin
self join
outer join
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Tuesday, September 04, 2007
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Yes, so long as what they generate ends up as part of an XML-conformant file (ie either valid or just well-formed).
Server-side tag-replacers like shtml, PHP, JSP, ASP, Zope, etc store almost-valid files using comments, Processing Instructions, or non-XML markup, which gets replaced at the point of service by text or XML markup (it is unclear why some of these systems use non-HTML/XML markup).

 

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Tuesday, September 11, 2007
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Join is a process of retrieve pieces of data from different sets (tables) and returns them to the user or program as one  collection of data.
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Wednesday, September 12, 2007
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