def _post_delete_sql(self, style, db_table):
        sql = (style.SQL_KEYWORD('SELECT ') +
               style.SQL_KEYWORD('DropGeometryColumn') + '(' +
               style.SQL_TABLE(gqn(db_table)) + ', ' +
               style.SQL_FIELD(gqn(self.column)) +  ');')
        return sql
%prog join file1.txt(pivotfile) file2.txt ..
dataset/ETHPy150Open CollabQ/CollabQ/vendor/django/contrib/gis/db/backend/postgis/field.py/PostGISField._post_delete_sql--crossover with--dataset/ETHPy150Open tanghaibao/jcvi/formats/base.py/join