Re: cast issue in WITH RECURION

> On 3 Aug 2017, at 20:22, k b <k_b0000(at)yahoo(dot)se> wrote:
>
> when i create a recursive query and try to add the distances i get a message:
> ERROR: recursive query "edges" column 3 has type numeric(7,3) in non-recursive term but type numeric overall.

> My exercise is almost identical to the example in the docs:
> WITH RECURSIVE search_graph(id, link, data, depth, path, cycle) AS (
> SELECT g.id, g.link, g.data, 1,
> ARRAY[g.id],
> false
> FROM graph g
> UNION ALL
> SELECT g.id, g.link,
> sg.data + g.data, -- altered section, data is numeric(7,3)
> sg.depth + 1,
> path || g.id,
> g.id = ANY(path)
> FROM graph g, search_graph sg
> WHERE g.id = sg.link AND NOT cycle
> )
> SELECT * FROM search_graph;

I believe the solution is rather simple; just cast(sg.data + g.data to numeric(7,3))

Alban Hertroys
--
If you can't see the forest for the trees,
cut the trees and you'll find there is no forest.