Question: What is the average NGC number that has a Apparent magnitude greater than 14.2?
SQL: SELECT AVG("NGC number") FROM "2-11051845-10" WHERE "Apparent magnitude" > 14.2;

Question: What is the highest NGC number that has a Declination ( J2000 ) of °04′58″ and a Apparent magnitude larger than 7.3?
SQL: SELECT MAX("NGC number") FROM "2-11051845-10" WHERE "Declination ( J2000 )" = '°04′58″' AND "Apparent magnitude" > 7.3;

Question: What Constellation has a Object type of Globular cluster and a NGC number of 5986?
SQL: SELECT "Constellation" FROM "2-11051845-10" WHERE "Object type" = 'Globular cluster' AND "NGC number" = 5986.0;