user: Question: What is the Right Ascension with a Diffuse nebula Object Type has a °42′30″ Declination and a NGC less than 6995?
Columns: ['NGC number', 'Object type', 'Constellation', 'Right ascension ( J2000 )', 'Declination ( J2000 )']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [6913.0, 'Open cluster', 'Cygnus', '20h23m56s', '°31′']
SQL:

assistant: SELECT "Right ascension ( J2000 )" FROM "Table" WHERE "NGC number" < 6995.0 AND "Object type" = 'Diffuse nebula' AND "Declination ( J2000 )" = '°42′30″';