user: ### NOW ANSWER:
Question: Before round 7, what is the greatest Pick # for a player that plays defensive tackle?
Columns: ['Round', 'Pick #', 'Overall', 'Name', 'Position', 'College']
Types: ['real', 'real', 'real', 'text', 'text', 'text']
Sample row: [2.0, 23.0, 55.0, 'Bryan Scott', 'Safety', 'Penn State']
SQL:

assistant: SELECT MAX("Pick #") FROM "Table" WHERE "Position" = 'defensive tackle' AND "Round" < 7.0;