Table: t_1987_denver_dynamite_defensive
Columns: player
tackles
solo
assisted
sack
yards
td_s

Question: How many yards for the player with 20 solo tackles and under 0 TDs?
SQL: SELECT SUM("yards") FROM t_1987_denver_dynamite_defensive WHERE "solo" = 20 AND "td_s" < 0

Question: How many yards for the player with 1 solo tackle and over 0 sacks?
SQL: SELECT MAX("yards") FROM t_1987_denver_dynamite_defensive WHERE "solo" = 1 AND "sack" > 0