Basic Statistics with MAX, MIN, AVG, STDEV, & SUM

These do what you expect them to do

@output =
        MAX(Duration) AS DurationMax,
        MIN(Duration) AS DurationMin,
        AVG(Duration) AS DurationAvg,
        SUM(Duration) AS DurationSum,
        VAR(Duration) AS DurationVariance,
        STDEV(Duration) AS DurationStDev,
        VARP(Duration) AS DurationVarianceP,
        STDEVP(Duration) AS DurationStDevP
    FROM @searchlog
    GROUP BY Region;

Notes for Statisticians

VAR & STDEV are the sample version with Bessel's correction VARP & STDEVP are the better-known population version.

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