CREATE TABLE party_events (event_id NUMBER, event_name CLOB, party_id NUMBER, member_in_charge_id NUMBER)
CREATE TABLE region (region_id NUMBER, region_name CLOB, date CLOB, label CLOB, format CLOB, catalogue CLOB)
CREATE TABLE party (party_id NUMBER, minister CLOB, took_office CLOB, left_office CLOB, region_id NUMBER, party_name CLOB)
CREATE TABLE member (member_id NUMBER, member_name CLOB, party_id CLOB, in_office CLOB)

Count the number of different parties.
SELECT COUNT(DISTINCT party_name) FROM party
SELECT COUNT(DISTINCT "party_name") FROM "party"