Understanding TIMESTAMP (ROWVERSION) in SQL Server
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by Abhishek Kumar Singh
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Using TIMESTAMP with INSERT command

Insert one row in the table as given below.

Listing 3

INSERT INTO MyTestTable([SmallDateTime],[DateTime])VALUES(GETDATE(), GETDATE())

Now open the table using SQL Server Management Studio or executing SELECT query.

Listing 4

SELECT * FROM MyTestTable

The values in the table would be something like below. (In your result set, data/time values will be your current date of the computer.)

Listing 5

RowID       TimeStamp               SmallDateTime         DateTime
----------- ------------------ ----------------------- -----------------------
1           <span class=Bold>0x0000000000000FA1</span>      2008-09-20 02:27:00   2008-09-20 02:26:35.700

Though we had not inserted value in TimeStamp column, it has one value. This value is nothing but a binary formatted value. Each insert of a row in the table will automatically set the incremented by 1 value in the TimeStamp column.

For example, insert another row in the MyTestTable by executing the same insert query given above. Now open the table again. It would have added a second row with a new TIMESTAMP value which is nothing but the value incremented by one of pervious TIMESTAMP 0x0000000000000FA1.

Listing 6

RowID       TimeStamp          SmallDateTime           DateTime
----------- ------------------ ----------------------- -----------------------
1           0x0000000000000FA1 2008-09-20 02:27:00     2008-09-20 02:26:35.700
2           <span class=Bold>0x0000000000000FA2</span> 2008-09-20 02:39:00     2008-09-20 02:38:39.763

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Title: Understanding TIMESTAMP (ROWVERSION) in SQL Server   
Name: Stuart Steedman
Date: 2011-01-26 4:08:12 AM
Comment:
Thanks, Abhisheck. Good article. I can now see how the timestamp column could be used to reliably filter all new/changed records.

Stu
Title: Exact use of timestamp   
Name: Anu
Date: 2010-10-08 7:01:33 AM
Comment:
please tell me when and why tp use timestamp.. Confused a lot..
Title: Mr   
Name: tv Krishna Kanth
Date: 2010-07-20 7:33:53 AM
Comment:
To know the latest Timestamp in table you can write a query like "select @@dbts from tblName" .. Yes TimeStamp is datatype which is ofcourse not related to any date & time like data types. here dbtp means data base time stamp you can remember simply with this expansion.. When defining/using a timestamp in a table no need to declare its column name..But the rowversion would ask for the column name eventhough they both are similar in functionality as per my knowledge..
Title: Nonsense   
Name: RIG
Date: 2010-04-23 6:43:30 AM
Comment:
"Wikipedia.org defines timestamp in very clear manner, as follows:

A timestamp is a sequence of characters, denoting the date and/or time at which a certain event occurred."

Right. But TIMESTAMP in MS SQL Server has nothing to do with date or time.
Title: excellent   
Name: Jeetendra
Date: 2010-04-16 3:52:33 AM
Comment:
This is Excellent. Thanks.
Title: good   
Name: saravanan
Date: 2010-01-16 2:20:08 AM
Comment:
good article
Title: timestamp problem   
Name: arpizt
Date: 2009-10-29 9:35:55 PM
Comment:
"UPDATE table SET field = current_timestamp where (field=1)"
Error msg this field cannot been update.

Thanks.
Title: arpizt@gmail.com   
Name: abhishek
Date: 2009-10-28 6:41:21 PM
Comment:
arpizt@gmail.com can you post your query here?
Title: timestamp problem   
Name: arpizt@gmail.com
Date: 2009-10-27 5:53:58 AM
Comment:
Hi,

I try to run the insert sql, but got this error ("Column or expression 'PaymentDate' cannot be updated." Why? How to overcome this problem?
Title: Abhishek Your Time Stamp Aarticle too good   
Name: Gbbs Mith
Date: 2009-06-13 5:02:18 AM
Comment:
The article is very good because it was justified clearly time and datetime data type. Hope more such article

Thanks
Title: Beginner   
Name: nagarajan
Date: 2009-03-17 9:47:06 AM
Comment:
excellent artice about TIMESTAMP.
Title: good   
Name: Jen
Date: 2008-12-18 4:57:37 AM
Comment:
good for quick walkthrough.






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