What is the sum of silver medals of the nation Cuba, which has less than 0 gold?
CREATE TABLE table_name_7 (silver INTEGER, nation VARCHAR, gold VARCHAR)
SELECT SUM(silver) FROM table_name_7 WHERE nation = "cuba" AND gold < 0
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_7 (silver INTEGER, nation VARCHAR, gold VARCHAR) Question: What is the sum of silver medals of the nation Cuba, which has less than 0 gold? [/INST] SELECT SUM(silver) FROM table_name_7 WHERE nation = "cuba" AND gold < 0 </s>