SELECT * FROM ApproxPercentileReduce (
ON ([ SELECT * FROM ] ApproxPercentileMap (
ON { table | view | (query) }
TargetColumns ({ 'target_column' | 'target_column_range' }[,...])
[ ErrorRate (error) ]
[ GroupColumns ({ 'group_column' | group_column_range }[,...]) ]
)
) PARTITION BY [ 1 | group_column [,...]]
[ Percentile (percentile [,...]) ]
[ TargetColumns
({ 'target_column' | target_column_range }[,...]) ]
[ GroupColumns ({ 'group_column' | group_column_range }[,...]) ]
);