user: Question: What is the hardness for the alloy that is liquid at 243 degrees C?
Columns: ['Usage', 'Sn/Sb (%)', 'Liquid at (°C)', 'Casting at (°C)', 'Remelting at (°C)', 'Hardness']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Typograph', '3/12', '250', '280…290', '310…330', '19']
SQL:

assistant: SELECT "Hardness" FROM "Table" WHERE "Liquid at (°C)" = '243';