user: Question: On what Date was the Works Number 7?
Columns: ['Number', 'Builder', 'Type', 'Date', 'Works number']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Hawthorn Leslie and Company', '0-6-0 T', '1881', '1884']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Works number" = '7';