user: Question: What is the birthdate of Robert Esche?
Columns: ['Position', 'Jersey #', 'Name', 'Height (cm)', 'Weight (kg)', 'Birthdate', 'Birthplace', '2008–2009 Team']
Types: ['text', 'real', 'text', 'real', 'real', 'text', 'text', 'text']
Sample row: ['G', 30.0, 'Scott Clemmensen', 191.0, 98.0, 'July 23, 1977', 'Des Moines, Iowa', 'New Jersey Devils']
SQL:

assistant: SELECT "Birthdate" FROM "Table" WHERE "Name" = 'Robert Esche';