What year was number 7 built?
CREATE TABLE table_1015421_1 (year_built VARCHAR, no_built VARCHAR)
SELECT year_built FROM table_1015421_1 WHERE no_built = 7
### Context: CREATE TABLE table_1015421_1 (year_built VARCHAR, no_built VARCHAR) ### Question: What year was number 7 built? ### Answer: SELECT year_built FROM table_1015421_1 WHERE no_built = 7