Question: Which Subregion has a No P. of 4, and a Pop/Area (1/km²) of 534?
SQL: SELECT "Subregion" FROM "2-1794599-1" WHERE "No P." = 4.0 AND "Pop/Area (1/km²)" = 534.0;

Question: Which Pop/Area (1/km²) has a No P. larger than 1, and a Name of Albergaria-a-Velha?
SQL: SELECT AVG("Pop/Area (1/km²)") FROM "2-1794599-1" WHERE "No P." > 1.0 AND "Name" = 'Albergaria-a-Velha';

Question: Which Area (km²) is the lowest one that has a Population of 17089?
SQL: SELECT MIN("Area (km²)") FROM "2-1794599-1" WHERE "Pop." = 17089.0;