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Can we use Truncate command on a table which is referenced by FOREIGN KEY

Posted By :nishithraj     Posted Date :March 31, 2010    Points :10   Category :Sql Server 
No. We cannot use Truncate against of referential integrity.

You can also find related Interview Question to Can we use Truncate command on a table which is referenced by FOREIGN KEY  below: 

Can we use Truncate command on a table which is referenced by FOREIGN KEY?

  
No. We cannot use Truncate command on a table with Foreign Key because of referential integrity (More...)

Can we use Truncate command on a table which is referenced by FOREIGN KEY?

  
No. We cannot use Truncate command on a table with Foreign Key because of referential integrity (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 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 command is used to create a table by copying the structure of another table?

  
CREATE TABLE .. AS SELECT command
Example:-
CREATE TABLE AS SELECT*FROM WHERE 1=2; (More...)

What is the error in the following command?
DROP TABLE &TABLE_NAME;

  
Variable names should start with an alphabet. Here the table name starts with an '&' symbol. So it will give a compilation error. (More...)

Delete and Truncate Command:

  


DELETE is a DML command and can be rolled back
Delete can use where clause

TRUNCATE is a DDL command and cannot be rolled back. All of the memory space is released back to the server
Truncate cannot use where clause

(More...)

Difference between Delete and Truncate command?

  
Delete Command:
Delete a row based on where Condition.
Truncate command:
Delete all the Rows from table.

(More...)

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