Table: davis_cup_poland
Columns: year
competition
date
location
score
result

Question: How many years has there been a competition in Helsinki?
SQL: SELECT COUNT("year") FROM davis_cup_poland WHERE "location" = 'helsinki'

Question: Which competition before 1982 had a score of 2:3?
SQL: SELECT "competition" FROM davis_cup_poland WHERE "year" < 1982 AND "score" = '2:3'

Question: Which competition occurred after 1980 with a score of 0:5 in Jerusalem?
SQL: SELECT "competition" FROM davis_cup_poland WHERE "year" > 1980 AND "score" = '0:5' AND "location" = 'jerusalem'