There’s a number of options available for shooting at night time, if we discuss them based on the parts of the exposure triangle 1) shutter speed - you can shoot at slower shutter speeds if you mount on a tripod as this avoids blur from camera shake. You can also shoot with lenses or cameras that have stabilisation, now often 4-5 stops, allowing you to hand hold at 1/2 second. 2) aperture - use prime lenses that have wide maximum apertures this will allow more light on. 3) ISO - increase your ISO it’s maximum acceptable level. This will depend on how if you want to view your image, how much you will crop and how much noise you personally are happy with. Larger sensor cameras allow higher ISO settings with less noise and even modern crop sensor cameras will be better than older cameras. Lastly, there is new software that provides drastically better noise reduction: Topaz labs sell a noise reduction software that’s much better than the noise reduction that comes with PS and the like. It’s a lot of money for essentially one function, but if you consider people pay thousands for bodies that have less noise at higher ISOs or very wide aperture lenses so they can avoid noise in low light conditions then it starts to make a bit more sense.
hope this helped a little.