DropGeometryColumn

Name

DropGeometryColumn — Removes a geometry column from a spatial table.

Synopsis

text DropGeometryColumn ( varchar table_name , varchar column_name ) ;

text DropGeometryColumn ( varchar schema_name , varchar table_name , varchar column_name ) ;

text DropGeometryColumn ( varchar catalog_name , varchar schema_name , varchar table_name , varchar column_name ) ;

Description

Removes a geometry column from a spatial table. Note that schema_name will need to match the f_table_schema field of the table's row in the geometry_columns table.

This method implements the OGC Simple Features Implementation Specification for SQL 1.1.

This function supports 3d and will not drop the z-index.

This method supports Circular Strings and Curves.

[Note]

Changed: 2.0.0 This function is provided for backward compatibility. Now that since geometry_columns is now a view against the system catalogs, you can drop a geometry column like any other table column using ALTER TABLE

Examples

			SELECT DropGeometryColumn ('my_schema','my_spatial_table','geom');
			----RESULT output ---
			                  dropgeometrycolumn
------------------------------------------------------
 my_schema.my_spatial_table.geom effectively removed.

-- In PostGIS 2.0+ the above is also equivalent to the standard
-- the standard alter table.  Both will deregister from geometry_columns
ALTER TABLE my_schema.my_spatial_table DROP column geom;