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Results tagged with greatest-n-per-group
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not deleted
user 126936
Use this for problems that involve returning one or more rows from each group in a data set. Despite the name, this tag is suitable for *minimum-* and *maximum-* per group queries.
29
votes
Accepted
SQL Server - Select most recent record from each group when performance is critical
If you have a small-enough number of (StationID, ParameterID) pairs, then try a query like this:
select StationID, ParameterID, m.DateTime LastDate
from StationParameter sp
cross apply
(
sel …
- 47.6k