Well, I have a feeling there could be a better solution, but you might be able to solve this using a point link. The idea would be
Select from your database into the value point. Create a second SQL point that sets a timestamp value to some useful place in your database. Create a point link from the value point to the timestamp point, and use the pointlink to turn it into something like ('src Pnt Name', timestamp) to set that value into the database (via the second SQL point). Build you select to reference that stored timestamp so that you get the right point.It's not the most elegant solution, but it should ensure that you're getting new-er values while still ensuring you're not just getting the new-est.
