SELECT
    C() as speed_of_light,        -- 299792458 m/s
    ME() as electron_mass,        -- 9.109e-31 kg
    PLANCK() as planck_constant,  -- 6.626e-34 J⋅s
    NA() as avogadro_number       -- 6.022e23 mol⁻¹
FROM DUAL

