Erland Sommarskog (esquel@sommarskog.se) writes:
> UPDATE t
> SET speed = p.speed +
> 1E0 * (n.speed - p.speed) * (t.ident - t.prevval) /
> (t.nextval - t.prevval)
> FROM #temp t
> JOIN #temp p ON t.prevval = p.ident
> JOIN #temp n ON t.nextval = n.ident
> WHERE t.speed IS NULL

So I did not consider time. This might be better:

UPDATE t
SET speed = p.speed +
1E0 * (n.speed - p.speed) *
datediff(ms, p.entrytime, t.entrytime) /
datediff(ms, p.entrytime, n.entrytime)
FROM #temp t
JOIN #temp p ON t.prevval = p.ident
JOIN #temp n ON t.nextval = n.ident
WHERE t.speed IS NULL




--
Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se

Books Online for SQL Server SP3 at
http://www.microsoft.com/sql/techinf...2000/books.asp