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Home >> Interview Question >> .NET Framework >> Post New Question Subscribe to Interview Questions

What is Hash Table?

Posted By :Hema     Posted Date :July 23, 2010    Points :10   Category :.NET Framework 
Hash Table stores a key,Value type collection of data we can
retrieve items from Hash table to provide the key.both Key &
value are objects.

You can also find related Interview Question to What is Hash Table?  below: 

What are the privileges that can be granted on a table by a user to others?

  
Insert, update, delete, select, references, index, execute, alter, all (More...)

What command is used to create a table by copying the structure of another table?

  
CREATE TABLE .. AS SELECT command

Explanation :

To copy only the structure, the WHERE clause of the SELECT command should contain a FALSE statement as in the following.
CREATE TABLE NEWTABLE AS SELECT * FROM EXISTINGTABLE WHERE 1=2;
If the WHERE condition is true, then all the rows or rows satisfying the condition will be copied to the new table. (More...)

How to get a row was inserted most recently in a table?

  
select top 1 * from tablename order by ColumnName desc (More...)

How To Update Description Value for a Column in Table using SQL Command?

  
We can Update Description to Column using sp_updateextendedproperty System Store Procedure.
Sample Command to Update Description for Column in a Table:

EXEC sys.sp_updateextendedproperty @name=N'MS_Description', @value=N'My Description for Column Here' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'MyTableName', @level2type=N'COLUMN',@level2name=N'ColumnName' (More...)

How To Delete Description Value for a Column in Table using SQL Command?

  
We can Delete Description from Column using sp_dropextendedproperty System Store Procedure.
Sample Command to Delete Description from Column in a Table:

EXEC sys.sp_dropextendedproperty @name=N'MS_Description', @value=N'My Description for Column Here' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'MyTableName', @level2type=N'COLUMN',@level2name=N'ColumnName' (More...)

How To Get Description Value for all Column in Table using SQL Command?

  
To Get Description of Columns we need to use system function sys.fn_listextendedproperty.
Command To Get Description Data for all Columns:

SELECT * FROM fn_listextendedproperty(NULL, 'SCHEMA',
'dbo', 'TABLE', 'YourTable Name Here', 'COLUMN', NULL) (More...)

How To Get Description Value for Single Column in Table using SQL Command?

  
To Get Description of Single Column we need to use system function sys.fn_listextendedproperty. we need to pass the column Name is this case.
Command To Get Description Data for Single Columns:

SELECT * FROM fn_listextendedproperty(NULL, 'SCHEMA',
'dbo', 'TABLE', 'Table Name Here', 'COLUMN', 'Column Name Here') (More...)

Which system table holds the details of all the processes running on the Microsoft sql server?

  
The name of the system table is sysprocesses .

Select * from sysprocesses


Make sure you run this query in master database. (More...)

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