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What is the purpose of the USE command?

Posted By :Narayanan     Posted Date :August 29, 2011    Points :40   Category :Sql Server 
used for to select the database. For i.e Use Database Name

You can also find related Interview Question to What is the purpose of the USE command?  below: 

What happens when we issue Dataset.ReadXml command?

  
Reads XML schema and data into the DataSet. (More...)

what is used to execute a .net file from the command prompt ?

  
csc is C# compiler abbreviation is C Sharp Compiler (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...)

What is the main purpose of having Conversation Group?

  
It's a way of grouping all the dialogs that are used for a particular task. All the dialogs associated with processing a particular order would be grouped into a single conversation group. The conversation group is implemented as a conversation group identifier, which is included with all messages in all dialogs contained in the conversation group. When a message is received from any of the dialogs in a conversation group, the conversation group is locked with a lock that is held by the receiving transaction. For the duration of the transaction, only the thread that holds the lock can receive messages from any of the dialogs in the conversation group. This makes our order entry application much easier to write because even though we use many threads for scalability, any particular order is only processed on one thread at a time. This means we don't have to make our application resilient to problems that are caused by the simultaneous processing of a single order on multiple threads. (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 we can add Description to the Column using Sql Command?

  
We can Add Description to Column using sp_addextendedproperty System Store Procedure.
Sample Command to Insert Description for Column in a Table:

EXEC sys.sp_addextendedproperty @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',
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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',
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How We can get the DB name using SQL Command?

  
Following is the Command to get the DB name using Command analyzer

SELECT DB_NAME() (More...)

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