user: Question: What is the least apparent magnitude for all constellations from Hydra?
Columns: ['NGC number', 'Object type', 'Constellation', 'Right ascension ( J2000 )', 'Declination ( J2000 )', 'Apparent magnitude']
Types: ['real', 'text', 'text', 'text', 'text', 'real']
Sample row: [3603.0, 'Diffuse nebula', 'Carina', '11h15m09.1s', '°16′17″', 10.1]
SQL:

assistant: SELECT MIN("Apparent magnitude") FROM "Table" WHERE "Constellation" = 'Hydra';