November 29, 2012 at 9:43 am
is there a system level field that get updated for a table every time a row is updated?
November 29, 2012 at 9:44 am
sonal_anjaria (11/29/2012)
is there a system level field that get updated for a table every time a row is updated?
Not sure what you are looking for here exactly. There is nothing per row that gets updated when an update occurs that would indicate the row was updated.
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November 29, 2012 at 10:03 am
There is a row version value stored by the system, in order to deal with snapshots, but it's not something you have access to.
If you need to track that kind of thing, add a RowVersion type column to the table. Data here: http://msdn.microsoft.com/en-us/library/ms182776.aspx
If you need to know when a row was updated, then you're getting into audit trails (Change Data Capture, triggers, log parsers, et al), or at least a column with DateTime or DateTime2 or DateTimeOffset. If you use the added column, you'll need to modify code that updates the table so that it updates that column, or add a trigger to the table to handle the update. CDC (Change Data Capture) is easier and has much less of a performance hit than triggers, but is only available in Enterprise edition.
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November 29, 2012 at 3:39 pm
No. SQL does not normally track that a row has changed.
SQL will add columns that might be used to determine that when you specify certain things for a given table, such as replication, but SQL does not do it by default.
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