On Tuesday, October 24, 2017 at 7:12:48 AM UTC-7, Rob Sharp wrote:
>
> Hi group,
>
> I'm not 100% sure of the terminology here, but how can I join my existing
> dataset using the equivalent of what I have below?
>
> SELECT fruits.*, map_fruit_a, map_fruit_b FROM fruits
> JOIN (
> VALUES(
> 'pineapple',
> 'banane',
> 'apple',
> 'pomme'
> )
> ) AS mapped_fruits(
> fruit_a,
> map_fruit_a,
> fruit_b,
> map_fruit_b
> )
> ON mapped_fruits.fruit_a = fruits.name
>
> Any help appreciated!
>
Since this is a single row, a select query that returns one row should work:
DB[:fruits].
join(DB.select('pineapple', 'banane', 'apple',
'pomme').as(:mapped_fruits, [:fruit_a, :map_fruit_a, :fruit_b,
:map_fruit_b]), :fruit_a=>:name).
select_all(:fruits).
select_append(:map_fruit_a, :map_fruit_b)
Thanks,
Jeremy
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