def index_pkey(db, table, recover=None):

    '''Makes the first column in a table the primary key.

    @pre The table must not already have a primary key.

    '''

    table = sql_gen.as_Table(table)

    index = sql_gen.as_Table(table.name+'_pkey')

    col = sql_gen.to_name_only_col(pkey(db, table, recover))

    run_query(db, 'ALTER TABLE '+table.to_str(db)+' ADD CONSTRAINT '

        +index.to_str(db)+' PRIMARY KEY('+col.to_str(db)+')', recover=recover)