user: Question: What is the total round of the tight end position player?
Columns: ['Player', 'Position', 'Round', 'Pick', 'NFL Club']
Types: ['text', 'text', 'real', 'real', 'text']
Sample row: ['Bryan Bulaga', 'Tackle', 1.0, 23.0, 'Green Bay Packers']
SQL:

assistant: SELECT SUM("Round") FROM "Table" WHERE "Position" = 'tight end';