user: Question: What is the highest selection number for the Saskatchewan Roughriders team?
Columns: ['Pick #', 'CFL Team', 'Player', 'Position', 'College']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [45.0, 'Calgary Stampeders', 'Brett Ralph', 'WR', 'Alberta']
SQL:

assistant: SELECT MAX("Pick #") FROM "Table" WHERE "CFL Team" = 'Saskatchewan Roughriders';