Ecto.Query.WindowAPI.dense_rank
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dense_rank
, go back to Ecto.Query.WindowAPI module for more information.
Returns rank of the current row without gaps; this function counts peer groups.
from p in Post,
select: dense_rank() |> over(partition_by: p.category_id, order_by: p.date)
Note that this function must be invoked using window function syntax.