LTirrellUntitled Query
    SELECT DISTINCT
    [Month],
    Mean = AVG(Score) OVER (PARTITION BY [Month]),
    StdDev = STDEV(Score) OVER (PARTITION BY [Month]),
    P90 = PERCENTILE_CONT(0.9) WITHIN GROUP (ORDER BY Score) OVER (PARTITION BY [Month])
    FROM my_table
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