Posts Read Percentiles
Number of posts read for users in each percentile
with tentiles as (
select posts_read_count as read,
ntile(10)
over (order by posts_read_count) as tentile
from user_stats
)
select (tentile - 1) * 10 as percentile,
min(read) as min_posts_read,
max(read) as max_posts_read
from tentiles
group by tentile
order by tentile desc