question: What was the sum of Value ($M), when the Revenue ($M) was less than 307, the Team was Valencia, and the Rank was smaller than 19?
answer: SELECT SUM(value__) AS $m_ FROM table_name_3 WHERE revenue__$m_ < 307 AND team = "valencia" AND rank < 19
context: CREATE TABLE table_name_3 (value__ INTEGER, rank VARCHAR, revenue__$m_ VARCHAR, team VARCHAR)