添加不存在的列以查看

Question

如果該字段在源表中不存在，是否可以將SERIAL列添加到現有視圖？我想獲得一個名爲OID的autoincremental ID字段，它不能爲NULL。

CREATE OR REPLACE VIEW public.osm_polygon AS 

SELECT planet_osm_polygon.osm_id::text AS osm_id, 
    planet_osm_polygon.tags -> 'osm_timestamp'::text AS osm_timestamp, 
    planet_osm_polygon.tags -> 'name:en'::text AS name_en, 
    planet_osm_polygon.access, planet_osm_polygon.admin_level, 
    planet_osm_polygon.aerialway, planet_osm_polygon.aeroway, 
    planet_osm_polygon.amenity, planet_osm_polygon.area, 
    planet_osm_polygon.barrier, planet_osm_polygon.bicycle, 
    planet_osm_polygon.brand, planet_osm_polygon.bridge, way 
    planet_osm_polygon.boundary, planet_osm_polygon.building FROM planet_osm_polygon 
WHERE st_isvalid(planet_osm_polygon.way) AND planet_osm_polygon.way && st_makeenvelope((-17.5)::double precision, 3.0::double precision, 8.7::double precision, 26.9::double precision, 4326); 

這就是我的看法。

我需要添加一個包含自動增量字段作爲長整數或串不能爲NULL的列。有什麼建議麼？

Answer 1

使用row_number？

CREATE OR REPLACE VIEW public.osm_polygon AS 

SELECT planet_osm_polygon.osm_id::text AS osm_id, 
planet_osm_polygon.tags -> 'osm_timestamp'::text AS osm_timestamp, 
planet_osm_polygon.tags -> 'name:en'::text AS name_en, 
planet_osm_polygon.access, planet_osm_polygon.admin_level, 
planet_osm_polygon.aerialway, planet_osm_polygon.aeroway, 
planet_osm_polygon.amenity, planet_osm_polygon.area, 
planet_osm_polygon.barrier, planet_osm_polygon.bicycle, 
planet_osm_polygon.brand, planet_osm_polygon.bridge, way, 
planet_osm_polygon.boundary, planet_osm_polygon.building, 
row_number() over() as row_num 
FROM planet_osm_polygon 
WHERE st_isvalid(planet_osm_polygon.way) AND planet_osm_polygon.way && st_makeenvelope((-17.5)::double precision, 3.0::double precision, 8.7::double precision, 26.9::double precision, 4326);