Get all table names.

        Returns
        -------
        `set` of `str`

def get_tables(self):
        """Get all table names.

        Returns
        -------
        `set` of `str`
        """
        self.cursor.execute(
            'SELECT name FROM sqlite_master WHERE type="table"'
        )
        return set(x[0] for x in self.cursor.fetchall())