My table uses a SqlGeometery in SRID 3857.
Given a point, how would I find all shapes within a X miles or meters radius?
Put a Buffer around the point and run STIntersects to get all intersection shapes. Just make sure you put an index on the Geometry column otherwise it could get slow. Note that x is in meters (eg 10m).
SELECT *
FROM MyTable
WHERE MyGeometryShapesColumn.STIntersects(@MyGeometryPoint.STBuffer(10)) = 1;