CREATE TABLE table_52379 ("Player" CLOB, "Tackles" FLOAT, "Solo" FLOAT, "Assisted" FLOAT, "Sack" FLOAT, "Yards" FLOAT, "TD's" FLOAT)

How many yards for the player with 20 solo tackles and under 0 TDs?
SELECT SUM("Yards") FROM table_52379 WHERE "Solo" = '20' AND "TD's" < '0'
SELECT SUM("Yards") FROM "table_52379" WHERE "Solo" = '20' AND "TD's" < '0'