On Thursday, December 14, 2017 at 6:57:30 AM UTC-8, Gencer W. G. wrote:
>
> What I want to achieve:
>
> WITH summary AS (
> SELECT f.* ,
> ROW_NUMBER() OVER(PARTITION BY f.name
> ORDER BY f.version DESC) AS rk
> FROM files f WHERE f.user_id = 1 and f.is_deleted IS FALSE)
> SELECT s.*
> FROM summary s
> WHERE s.rk = 1"
>
> This query works as a RAW SQL. But I am unable to get f.*, row_number()
> together on Sequel. I only get row_number() for select. Also a little help
> on writing this query like above (for surrounding by WITH) is appreciated.
>
> So far tried:
>
> TableModel.select{Sequel[:reserves].*
> }.select{row_number.function.over(partition: object_name, order:
> version.desc).as(:rk)}.where(... # i did not finish the query.
>
> How do I make sure f* and row number as rk get together with surrounded
> WITH on Sequel query builder? Or should I use raw?
>
You don't need to use raw SQL for this:
DB.from{summary.as(:s)}.
select_all(:s).
where{s[:rk] =~ 1}.
with(:summary, DB.from{files.as(:f)}.
select_all(:f).
select_append{row_function.function.over(:partition=>f[:name],
:order=>f[:version].desc).as(:rk)}.
where{f[:user_id] =~ 1}.
where{f[:deleted_at] =~ false})
Thanks,
Jeremy
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