Nigeria had the fastest time once.
CREATE TABLE table_1231316_5 (fastest_time__s_ VARCHAR, nation VARCHAR)
SELECT COUNT(fastest_time__s_) FROM table_1231316_5 WHERE nation = "Nigeria"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_1231316_5 (fastest_time__s_ VARCHAR, nation VARCHAR) Question: Nigeria had the fastest time once. [/INST] SELECT COUNT(fastest_time__s_) FROM table_1231316_5 WHERE nation = "Nigeria" </s>