CREATE TABLE table_69800 ("Rank" FLOAT, "Nation" CLOB, "Gold" FLOAT, "Silver" FLOAT, "Bronze" FLOAT, "Total" FLOAT)

How many silver medals does Cuba have?
SELECT SUM("Silver") FROM table_69800 WHERE "Nation" = 'cuba'
SELECT SUM("Silver") FROM "table_69800" WHERE "Nation" = 'cuba'