CREATE TABLE "3101_3200" (
  "ngc_number" real,
  "object_type" text,
  "constellation" text,
  "right_ascension_j2000" text,
  "declination_j2000" text
);

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 "3101_3200" 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 "3101_3200" 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 "3101_3200" WHERE "declination_j2000"='°25′26″';