user: Question: Name the start of an event in Catagory 2 of the year 1947.
Columns: ['Year', 'Stage', 'Category', 'Start', 'Finish', 'Leader at the summit']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [2009.0, 8.0, '2', 'Andorra la Vella', 'Saint-Girons', 'Sandy Casar']
SQL:

assistant: SELECT "Start" FROM "Table" WHERE "Category" = '2' AND "Year" = 1947.0;