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what is view in sql give short describtion?

Posted By :Dhivakaran     Posted Date :November 30, 2010    Points :10   Category :Sql Server 
View is a subset of a table, can be used to retrieve data, insert or Update data. Can contain multiple select statements inside

You can also find related Interview Question to what is view in sql give short describtion?  below: 

What is a view?

  
If we have several tables in a db and we want to view only specific columns from specific tables we can go for views. It would also suffice the needs of security some times allowing specfic users to see only specific columns based on the permission that we can configure on the view. Views also reduce the effort that is required for writing queries to access specific columns every time. (More...)

What is a view? How it is related to data independence?

  
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. (More...)

What is VDL (View Definition Language)?

  
It specifies user views and their mappings to the conceptual schema. (More...)

Session state vs View state

  
In some cases, using view state is not feasible. The alternative for view state is session state. Session state is employed under the following situations:
. Large amounts of data - View state tends to increase the size of both the HTML page sent to the browser and the size of form posted back. Hence session state is used.
. Secure data - Though the view state data is encoded and may be encrypted, it is better and secure if no sensitive data is sent to the client. Thus, session state is a more secure option.
. Problems in serializing of objects into view state - View state is efficient for a small set of data. Other types like DataSet are slower and can generate a very large view state (More...)

Can you describe IUKNOWN interface in short ?

  
Every COM object supports at least one interface, the IUnknown interface. All interfaces are classes derived from the base class IUnknown. Each interface supports methods access data and perform operations transparently to the programmer. For example, IUnknown supports three methods, AddRef, Release(), and QueryInterface(). Suppose that pinterf is a pointer to an IUnknown. pinterf->AddRef() increments the reference count. pinterf->Release() decrements the reference count, deleting the object when the reference count reaches zero. pinterf->QueryInterface( IDesired, pDesired) checks to see if the current interface (IUnknown) supports another interface, IDesired, creates an instance (via a call to CoCreateInstance()) of the object if the reference count is zero (the object does not yet exist), and then calls pDesired->AddRef() to increment the reference count (where pDesired is a pointer to IDesired) and returns the pointer to the caller. (More...)

What is View State Chunking?

  
View state chunking is new in ASP.NET, version 2.0.The ViewState property retains values between multiple requests for the same page. When an ASP.NET page is processed, the current state of the page and controls is hashed into a string and saved in the page as a hidden field. If the data is too long for a single field (as specified in the MaxPageStateField-Length property), then ASP.NET performs view state chunking to split it across multiple hidden fields. (More...)

Is view state lost if a user refreshes a Web page? What if the user copies the URL and open it in other browser?

  
View state is maintained within a page's HTML, so it is lost if a page is refreshed or if the URL is copied. (More...)

Grid View and Details View in ASP.NET 2.0.

  
Some of the new web controls featured in the .NET framework 2.0 beta include the GridView and DetailsView object. These controls offer more features than in the 1.1 version of the framework, featuring:

* Automatic paging and sorting with no coding needed
* Automatic Insert, Update, and Delete capabilities
* Complete command button functionality (such as the Edit, Update, and Cancel buttons) without any coding
* Minimal amount of coding involved than in previous versions of the framework (More...)

Name of the command to view the current amount of free (unallocated) space in the database in SQL Server?

  
Name of command is :sp_spaceused

This command displays the database_size in MB, and it's also shows unallocated space for the database. (More...)

Give Some Examples of Generic Classes?

  
List,Queue,Stack,LinkedList,HashSet (More...)

Session state vs. View state:

  
In some cases, using view state is not feasible. The alternative for view state is session state. Session state is employed under the following situations:
o Large amounts of data - View state tends to increase the size of both the HTML page sent to the browser and the size of form posted back. Hence session state is used.
o Secure data - Though the view state data is encoded and may be encrypted, it is better and secure if no sensitive data is sent to the client. Thus, session state is a more secure option.
o Problems in serializing of objects into view state - View state is efficient for a small set of data. Other types like DataSet are slower and can generate a very large view state. (More...)

Can the view state be encrypted?

  
The view state can be encrypted by setting EnableViewStateMac to true and either modifying the element in Machine.config to or by adding the above statement to Web.config. (More...)

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