user: Question: What is the lowest post number for Calvin Borel?
Columns: ['Finished', 'Post', 'Horse', 'Jockey', 'Trainer', 'Odds']
Types: ['text', 'real', 'text', 'text', 'text', 'real']
Sample row: ['1st', 7.0, 'Street Sense', 'Calvin Borel', 'Carl Nafzger', 4.9]
SQL:

assistant: SELECT MIN("Post") FROM "Table" WHERE "Jockey" = 'Calvin Borel';