A view may be thought of as a virtual table, that is, a table that does not really exist in its own right but is instead derived from one or more underlying base table. In other words, there is no stored file that direct represents the view instead a definition of view is stored in data dictionary.

Growth and restructuring of base tables is not reflected in views. Thus the view can insulate users from the effects of restructuring and growth in the database. Hence accounts for logical data independence.

Once the DBMS informs the user that a transaction has successfully completed, its effects should persist even if the system crashes before all its changes are reflected on disk. This property is called durability.

In the  base tables. Changes made to underlying tables are reflected in the views derived from them.

Technical analysis is predicting the future behaviour of the price movement of a particular stock on the basis of past price trends. Apart from price the other imp factor considered in technical analysis is the volume of the trade.Technical analysis beleives in foll:
1.Price discountws everything i.e demand , supply forces, marketnews etc all factors are reflected in the price for the given period.
2.Prices move in trends.
3.Trends are repetitive

Fundamental analysis is the practice of studying the fundamentals of a company to determine if a business is a
good investment.  Fundamental analysis can answer questions such as "what are the chances this business is going to go bankrupt" and "how certain can I be that this stock will continue paying dividends?"  It involves studying financial statements such as the balance sheet.

Ultra violet photography is a photographic process of recording images by using light from the ultraviolet (UV) spectrum only.There are two ways to use UV radiation to take photography - reflected ultraviolet and ultraviolet fluorescence