Question: what is the right ascension (j2000) when the constellation is Sextans and the declination (j2000) is °28′01″?
SQL: SELECT "Right ascension ( J2000 )" FROM "2-11097691-2" WHERE "Constellation" = 'Sextans' AND "Declination ( J2000 )" = '°28′01″';

Question: what is the constellation when the Right ascension ( J2000 ) is 10h18m58.4s?
SQL: SELECT "Constellation" FROM "2-11097691-2" WHERE "Right ascension ( J2000 )" = '10h18m58.4s';

Question: what is the highest ngc number when the declination (j2000) is °25′26″?
SQL: SELECT MAX("NGC number") FROM "2-11097691-2" WHERE "Declination ( J2000 )" = '°25′26″';