user: Question: Name number of stellar classification for 3 Neptune planets < 1 AU
Columns: ['Star', 'Stellar classification', 'Distance from Earth ( ly )', 'Constellation', 'Dust (or Debris; Temperature (K)', 'System', 'Dust (or Debris) Location (AU)', 'Cool Dust > 10 AU', 'Stellar Age (Myr)']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['η Corvi', 'F2V', '59', 'Corvus', '> 80', 'Unary', '< 3.5', 'yes', '1500']
SQL:

assistant: SELECT COUNT("Stellar classification") FROM "Table" WHERE "System" = '3 Neptune planets < 1 AU';