SQL - Rounding datetime and adding the result as an additional field for easy analysis

We currently have multiple tables that includes a datetime stamp which are updated every 10 seconds. we would like to do analysis on this data crossing tables via the datetime stamp and align records say within that 10 second window. As a record may have been placed at say 10:12:01 and a record we wish to match in another table say at 10:12:08 is it possible to create a calculated field that looks at the timestamp in individual table and rounds up say to the nearest 10 seconds so both the above would appear as 10:12:10

timestamp   rounded    data1 data2   data3   etc.......
10:12:01        10:12:10   xxxx    xxxx     xxxxx
10:12:08        10:12:10   xxxx    xxxx     xxxxx
10:12:11        10:12:20
10:12:15        10:12:20

Would this be achieved via a stored procedure or is there another way of adding this a calculated field. I would like to do this within SQL to make doing the analysis life easier.

Am new to this so any assistance would be appreciated.
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Scott PletcherSenior DBACommented:
Use a computed column to add it to the table itself.  SQL will instantiate the column any time it's reference.

ALTER TABLE table_name
ADD timestamp_rounded AS DATEADD(SECOND, DATEDIFF(SECOND, '20000101', getdate()) / 10 * 10, '20000101')

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Vitor MontalvãoMSSQL Senior EngineerCommented:
SimonJohnG, do you still need help with this question?
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