Question: Which Object type has a Constellation of Orion, and an NGC number larger than 2174, and a Declination (J2000) of °48′06″?
SQL: SELECT "Object type" FROM "2-11097664-2" WHERE "Constellation" = 'Orion' AND "NGC number" > 2174.0 AND "Declination ( J2000 )" = '°48′06″';

Question: Which Right ascension (J2000) has a Constellation of Mensa, and an NGC number larger than 2171?
SQL: SELECT "Right ascension ( J2000 )" FROM "2-11097664-2" WHERE "Constellation" = 'Mensa' AND "NGC number" > 2171.0;

Question: Which NGC number has an Object type of Open cluster, and a Right ascension (J2000) of 06h01m06s?
SQL: SELECT MAX("NGC number") FROM "2-11097664-2" WHERE "Object type" = 'Open cluster' AND "Right ascension ( J2000 )" = '06h01m06s';

Question: Which Object type has an NGC number of 2171?
SQL: SELECT "Object type" FROM "2-11097664-2" WHERE "NGC number" = 2171.0;