Table: koehler_fed_cup_stats
Columns: edition
round
date
partnering
against
surface
opponents
w_l
result

Question: What was the result for a partnering of Frederica Piedade?
SQL: SELECT "result" FROM koehler_fed_cup_stats WHERE "partnering" = 'Frederica Piedade'

Question: Which round has a win-loss result of loss and an edition of 2012 Fed Cup Europe/Africa Group I?
SQL: SELECT "round" FROM koehler_fed_cup_stats WHERE "w_l" = 'Loss' AND "edition" = '2012 Fed Cup Europe/Africa Group I'