user: Question: How many have a class of 330?
Columns: ['Class', 'Wheel arrangement', 'Manufacturer', 'Year made', 'Quantity made', 'Quantity preserved', 'Year(s) withdrawn', 'Comments']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['William George Beattie (1871–1878)', 'William George Beattie (1871–1878)', 'William George Beattie (1871–1878)', 'William George Beattie (1871–1878)', 'William George Beattie (1871–1878)', 'William George Beattie (1871–1878)', 'William George Beattie (1871–1878)', 'William George Beattie (1871–1878)']
SQL:

assistant: SELECT COUNT("Quantity made") FROM "Table" WHERE "Class" = '330';