Re: Table column vales to JSON object keys?

"David G. Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> writes:
> On Thursday, February 11, 2021, Wells Oliver <wells(dot)oliver(at)gmail(dot)com> wrote:
>> Trying to go from a table like:
>>
>> g | e | angle | path
>> ----+---+--------+----------------------
>> g1 | e1 | a1 | http://foo.com/a.mp4
>> g1 | e1 | a2 | http://foo.com/b.mp4
>> g1 | e1 | a3 | http://foo.com/c.mp4
>>
>> To a table like this, with a column value per angle as a key.
>>
>> g | e | obj
>> ----+---+---------------------------------------------------
>> ------------------------------------------
>> g1 | e1 | {"a1": "http://foo.com/a.mp4", "a2": "http://foo.com/b.mp4",
>> "a3": "http://foo.com/c.mp4"}
>>
>> Can't quite get there.

> How far can you get?

I'm guessing something like

SELECT g, e, json_object_agg(angle, path) FROM ... GROUP BY g, e

would work, but haven't experimented.

regards, tom lane