Table: ngc_objects_2001_3000
Columns: ngc_number
object_type
constellation
right_ascension_j2000
declination_j2000

Question: What is the average NGC number of everything with a Right ascension (J2000) of 05h33m30s?
SQL: SELECT AVG("ngc_number") FROM ngc_objects_2001_3000 WHERE "right_ascension_j2000" = '05h33m30s'

Question: What is the right ascension (J2000) with a Declination (J2000) of °12′43″, is a constellation of dorado, and has an NGC number larger than 2068?
SQL: SELECT "right_ascension_j2000" FROM ngc_objects_2001_3000 WHERE "ngc_number" > 2068 AND "constellation" = 'dorado' AND "declination_j2000" = '°12′43″'

Question: What type of object has an NGC number higher than 2090 and has a right ascension (J2000) of 05h52m19s?
SQL: SELECT "object_type" FROM ngc_objects_2001_3000 WHERE "ngc_number" > 2090 AND "right_ascension_j2000" = '05h52m19s'