Question: Name the total number of NGC number for sagittarius and diffuse nebula with declination of °02′
SQL: SELECT COUNT("NGC number") FROM "2-11051842-6" WHERE "Constellation" = 'sagittarius' AND "Object type" = 'diffuse nebula' AND "Declination ( J2000 )" = '°02′';

Question: I want to know the right ascension which has an NGC less than 6575 and declination of °38′00″
SQL: SELECT "Right ascension ( J2000 )" FROM "2-11051842-6" WHERE "NGC number" < 6575.0 AND "Declination ( J2000 )" = '°38′00″';

Question: Name the right ascension for Sagittarius and NGC number larger than 6522 for Open cluster and declination of °22′
SQL: SELECT "Right ascension ( J2000 )" FROM "2-11051842-6" WHERE "Constellation" = 'Sagittarius' AND "NGC number" > 6522.0 AND "Object type" = 'Open cluster' AND "Declination ( J2000 )" = '°22′';