Table: gil_davis_cup_match
Columns: edition
round
date
against
surface
opponent
result

Question: On which date was the opponent lamine ouahab?
SQL: SELECT "date" FROM gil_davis_cup_match WHERE "opponent" = 'lamine ouahab'

Question: On what date did the match take place in a round of 1r and have a result 2–6, 5–7, 2–6?
SQL: SELECT "date" FROM gil_davis_cup_match WHERE "round" = '1r' AND "result" = '2–6, 5–7, 2–6'

Question: What is the result of the match in round 1r against tunisia and on a hard surface?
SQL: SELECT "result" FROM gil_davis_cup_match WHERE "round" = '1r' AND "surface" = 'hard' AND "against" = 'tunisia'

Question: Who was the match against when on a clay surface during round 2r?
SQL: SELECT "against" FROM gil_davis_cup_match WHERE "round" = '2r' AND "surface" = 'clay'

Question: What round had a amtch against cyprus and an edition of 2010 davis cup europe/africa group ii?
SQL: SELECT "round" FROM gil_davis_cup_match WHERE "edition" = '2010 davis cup europe/africa group ii' AND "against" = 'cyprus'