How to split a polygon by a polygon using PostGIS?

I've a large polygon (table_a) that contains a smaller polygon (table_b). Now I want to split the larger polygon by the smaller polygon.

Unfortunately st_split(table_a.geom, table_b.geom) isn't working (Error: Splitting a Polygon by a Polygon is unsupported).

Is there any way to split a polygon by a polygon using PostGIS?