Table: election_results_1974_2
Columns: district
incumbent
party
first_elected
result
candidates

Question: what is the district with the candidates edward boland (d) unopposed?
SQL: SELECT "district" FROM election_results_1974_2 WHERE "candidates" = 'Edward Boland (D) Unopposed'

Question: what is the party where the candidates are edward boland (d) unopposed?
SQL: SELECT "party" FROM election_results_1974_2 WHERE "candidates" = 'Edward Boland (D) Unopposed'

Question: what is the party where the incumbent is edward boland?
SQL: SELECT "party" FROM election_results_1974_2 WHERE "incumbent" = 'Edward Boland'

Question: How many times was the candidates paul tsongas (d) 60.6% paul w. cronin (r) 39.4%?
SQL: SELECT COUNT("incumbent") FROM election_results_1974_2 WHERE "candidates" = 'Paul Tsongas (D) 60.6% Paul W. Cronin (R) 39.4%'