Hugo Kornelis (12/9/2013)
marcia.j.wilson (12/9/2013)
Any examples of how these would be used?Running totals. Traditionally done with slow set-based code, with a (relatively!) fast cursor, or with some dangerous unsupported side effect of a language feature.
In SQL Server 2012, very simple:
SELECT SalesPersonName,
SaleDate,
Amount,
SUM(Amount) OVER (PARTITION BY SalesPersonName
ORDER BY SaleDate
ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS RunningTotal
FROM YourTable
ORDER BY SalesPersonName, SaleDate;
Thanks. That helped me get a better picture of why you would use this.