SELECT * FROM ApproxPercentileReduce ( ON ( SELECT * FROM ApproxPercentileMap ( ON cracker TargetColumns ('pricesunshine', 'pricekeebler', 'pricenabisco', 'priceprivate') GroupColumns ('choice') ErrorRate (2) ) ) PARTITION BY choice GroupColumns ('choice') Percentile (0, 25, 50, 75, 100) TargetColumns ('pricesunshine', 'pricekeebler', 'pricenabisco', 'priceprivate') ) ORDER BY choice, percentile;