Question: what is the declination (j2000) that has a constellation of Hydra and a right ascension (j2000) of 10h46m44.9s?
SQL: SELECT "Declination ( J2000 )" FROM "2-11097691-4" WHERE "Constellation" = 'Hydra' AND "Right ascension ( J2000 )" = '10h46m44.9s';

Question: What is the ngc number when the object type is Lenticular galaxy and the constellation is Hydra?
SQL: SELECT MAX("NGC number") FROM "2-11097691-4" WHERE "Object type" = 'Lenticular galaxy' AND "Constellation" = 'Hydra';

Question: what is the object type when the ngc number is 3314?
SQL: SELECT "Object type" FROM "2-11097691-4" WHERE "NGC number" = 3314.0;

Question: what is the ngc number when the constellation is Leo and the declination (j2000) is °42′13″?
SQL: SELECT AVG("NGC number") FROM "2-11097691-4" WHERE "Constellation" = 'Leo' AND "Declination ( J2000 )" = '°42′13″';

Question: what is the right ascension (j2000) with the ngc number less than 3384, the constellation is Hydra and the object type is Spiral galaxy?
SQL: SELECT "Right ascension ( J2000 )" FROM "2-11097691-4" WHERE "NGC number" < 3384.0 AND "Constellation" = 'Hydra' AND "Object type" = 'Spiral galaxy';