CREATE TABLE table_7155 ("Rank" CLOB, "Nation" CLOB, "Gold" FLOAT, "Silver" FLOAT, "Bronze" FLOAT, "Total" FLOAT)

What is the sum of silver medals of the nation Cuba, which has less than 0 gold?
SELECT SUM("Silver") FROM table_7155 WHERE "Nation" = 'cuba' AND "Gold" < '0'
SELECT SUM("Silver") FROM "table_7155" WHERE "Gold" < '0' AND "Nation" = 'cuba'