04_random_points.sql

SELECT
    a.id,
    b.*
FROM (
    VALUES(
        1,
        ST_SetSRID(
            ST_GeomFromText(
                'POLYGON((0 0, -1 0, -1 -1, 0 -1, 0 0))'
            ),
        4326)
    )
    UNION ALL
    VALUES(
        2,
        ST_SetSRID(
            ST_GeomFromText(
                'POLYGON((0 0, 1 0, 1 1, 0 1, 0 0))'
            ),
        4326)
    )
) a(id, geom)
CROSS JOIN LATERAL (
    SELECT ST_SetSRID(ST_MakePoint(tmp.x, tmp.y), 4326) geom
    FROM (
        SELECT
            random() * (ST_XMax(a.geom) - ST_XMin(a.geom)) + ST_XMin(a.geom) x,
            random() * (ST_YMax(a.geom) - ST_YMin(a.geom)) + ST_YMin(a.geom) y
        FROM generate_series(0,200)
    ) tmp
) b;