user: Question: What is the ngc number when the object type is Lenticular galaxy and the constellation is Hydra?
Columns: ['NGC number', 'Object type', 'Constellation', 'Right ascension ( J2000 )', 'Declination ( J2000 )']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [3310.0, 'Spiral galaxy', 'Ursa Major', '10h38m45.9s', '°30′12″']
SQL:

assistant: SELECT "NGC number" FROM "Table" WHERE "Object type" = 'Lenticular galaxy' AND "Constellation" = 'Hydra';