Table: hercog_stats
Columns: year
edition
round
date
location
surface
against
opponent_s
score
result

Question: Which Round has a Year later than 2011?
SQL: SELECT "round" FROM hercog_stats WHERE "year" > 2011

Question: When was the Result of 3–2, with a Score of 6–0, 6–4?
SQL: SELECT "date" FROM hercog_stats WHERE "result" = '3–2' AND "score" = '6–0, 6–4'

Question: Which Surface has an Opponent(s) of anna-lena grönefeld tatjana malek?
SQL: SELECT "surface" FROM hercog_stats WHERE "opponent_s" = 'anna-lena grönefeld tatjana malek'

Question: Which Year has a Date of 5–6 february?
SQL: SELECT AVG("year") FROM hercog_stats WHERE "date" = '5–6 february'