user: ### NOW ANSWER:
Question: What was the Quantity on Date 1900?
Columns: ['Class', 'Type', 'Quantity', 'Date', 'LNER Class']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['2A', '4-4-0', 6.0, '1887–1892', 'D7']
SQL:

assistant: SELECT SUM("Quantity") FROM "Table" WHERE "Date" = '1900';