Nigeria competed on July2, 1999.
CREATE TABLE table_1231316_5 (date VARCHAR, nation VARCHAR)
SELECT date FROM table_1231316_5 WHERE nation = "Nigeria"
### Context: CREATE TABLE table_1231316_5 (date VARCHAR, nation VARCHAR) ### Question: Nigeria competed on July2, 1999. ### Answer: SELECT date FROM table_1231316_5 WHERE nation = "Nigeria"