Question: What's the area of the voivodenship with 51 communes?
SQL: SELECT "Area km² (1998)" FROM "1-11656578-2" WHERE "No. of communes" = 51.0;

Question: How big (in km2) is the voivodenship also known by the abbreviation kn?
SQL: SELECT "Area km² (1998)" FROM "1-11656578-2" WHERE "Abbreviation" = 'kn';

Question: How many people lived in the voivodenship whose capital is Siedlce in the year of 1980?
SQL: SELECT "Population (1980)" FROM "1-11656578-2" WHERE "Capital" = 'Siedlce';

Question: How many different voivodenship have 747 900 citizes?
SQL: SELECT COUNT("Voivodeship") FROM "1-11656578-2" WHERE "Population (1980)" = '747 900';