MySQL允许声明YEAR类型的列，借助它我们可以将年份值存储在该列中。
mysql> Create table year1 (Year_Copyright YEAR); mysql> Insert into year1(Year_Copyright) values (2017); mysql> Select * from year1; +----------------+ | Year_Copyright | +----------------+ | 2017 | +----------------+ 1 row in set (0.00 sec)