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Database: State whether a view can be used for updating or deleting rows from table on which it is created?

Posted By :shankey     Posted Date :July 25, 2011    Points :40   Category :Others 

Yes, view can update or delete from underlying tables.

You can also find related Interview Question to Database: State whether a view can be used for updating or deleting rows from table on which it is created?  below: 

Deleting Duplicates rows from the table?

  
delete from Employee where(EmpId Not In(Select Max(EmpId) from Employee Group By EmpName
-------------------------------
Note: EmpId Should Be identity column means Autogenerated column (More...)

Database should be created as a SINGLE_USER state Whenever you create a new Database. What should you do ?

  
1. Normally, when we create a new database, All the properties will be inherited from the Model database.

2. So, Just change the Model database's State to SINGLE_USER.

3. Now onwards, The new database will be created as SINGLE_USER state. (More...)

Database: How many primary key constraints can be created for one table?

  
Only one primary key constraints can be created for one table. (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...)

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...)

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...)

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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