Intersección de polígonos usando capas virtuales QGIS

Estoy tratando de intersectar geometrías de polígonos en QGIS usando una capa virtual:

SELECT
    sbqry.rowid AS gid,
    sbqry.geom
FROM
    (SELECT
        ST_Intersection(land_parcels.geometry, flood_zone.geometry) AS geom
    FROM land_parcels, flood_zone
    WHERE ST_Intersects(land_parcels.geometry, flood_zone.geometry) AND NOT ST_Touches(land_parcels.geometry, flood_zone.geometry))
    AS sbqry;

Desafortunadamente, sbqry.rowid AS giddevuelve NULL en lugar de valores de incremento automático.

¿Alguien sabe cómo crear una columna de identificador único llamada 'gid'? Hasta donde yo sé, las capas virtuales se basan en SQLite / Spatialite.

En PostGIS, si solo desea el número de fila, puede hacer esto:

SELECT
    row_number() over () as gid,
    sbqry.geom
FROM
    (SELECT
        ST_Intersection(land_parcels.geometry, flood_zone.geometry) AS geom
    FROM land_parcels, flood_zone
    WHERE ST_Intersects(land_parcels.geometry, flood_zone.geometry) AND NOT ST_Touches(land_parcels.geometry, flood_zone.geometry))
    AS sbqry;

SELECT  f.rowid AS gid, f.geom
FROM
(SELECT sbqry.geom
FROM (SELECT ST_Intersection(land_parcels.geometry, flood_zone.geometry) AS geom FROM land_parcels, flood_zone 
WHERE ST_Intersects(land_parcels.geometry, flood_zone.geometry) AND NOT ST_Touches(land_parcels.geometry, flood_zone.geometry)) AS sbqry) as f