Name
DropTopoGeometryColumn — Drops the topogeometry column from the table named table_name in schema schema_name and unregisters the columns from topology.layer table.
Synopsis
text DropTopoGeometryColumn(varchar  schema_name, varchar  table_name, varchar  column_name);
Description
Drops the topogeometry column from the table named table_name in schema schema_name and unregisters the columns from topology.layer table. Returns summary
                of drop status.  NOTE: it first sets all values to NULL before dropping to bypass referential integrity checks.
Availability: 1.?
Examples
SELECT topology.DropTopoGeometryColumn('ma_topo', 'parcel_topo', 'topo');