user: Question: What is the total round of the rb player from purdue with a pick less than 3?
Columns: ['Round', 'Pick', 'Overall', 'Name', 'Position', 'College']
Types: ['real', 'real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 3.0, 3.0, 'Charley Taylor', 'WR', 'Arizona State']
SQL:

assistant: SELECT SUM("Round") FROM "Table" WHERE "Position" = 'rb' AND "College" = 'purdue' AND "Pick" < 3.0;