Fred
thanks for help
Fred Lehodey wrote:
you can try:
1)
CREATE SEQUENCE my_seq START 1
2)
CREATE VIEW my_view AS
SELECT nextval('my_seq'), otherfield, ...
FROM mytable1, mytable2
it worked :)
CREATE SEQUENCE final_sps_elevation_seq START 1;
CREATE OR REPLACE VIEW "final_sps_elevation" (
id,
geom_field,
elevation)
AS
SELECT nextval('final_sps_elevation_seq') AS id, geom_field, elevation
FROM final_sps_s UNION ALL
SELECT nextval('final_sps_elevation_seq') AS id, geom_field,elevation
FROM final_sps_r;
But QGIS still complains :(
The view 'public.final_sps_elevation' has no column suitable for use as
a unique key.
Qgis requires that the view has a column that can be used as a unique
key. Such a column should be derived from a table column of type int4
and be a primary key, have a unique constraint on it, or be a PostgreSQL
oid column. To improve performance the column should also be indexed.
The view you selected has the following columns, none of which satisfy
the above conditions:
'elevation' derives from 'public.final_sps_r.elevation' and is not
suitable (type is float4 and does not have a suitable constraint)
'geom_field' derives from 'public.final_sps_r.geom_field' and is not
suitable (type is geometry and does not have a suitable constraint)
I tried to create INDEX on VIEW but this failed.
I wonder if there is any other way to create VIEW so it can be visible
in QGIS.
It is just academic as I'm using mainly Manifold.
Regards
Piotr
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