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What is the difference between YEAR(2) and YEAR(4) in MySQL?
YEAR(2) stores a year in 2-digit format. For example, we can write 69 to store 1969 a year. In YEAR (2), the year can be specified from 1970 to 2069 (70 to 69).
YEAR(4) stores a year in 4-digit format. For example, we need to write 19669 to store 1969 as a year. In YEAR (4), the year can be specified from 1901 to 2155.
MySQL interprets 2-digit year values with the assistance of following rules:
- Year values within the vary 00-69 are converted to 2000-2069.
- Year values in the range 70-99 are converted to 1970-1999.
We must not store date values as a 2-digit format because values stored in this format becomes vague as the century is unknown.
It can be understood more clearly with the help of following MySQL example −
mysql> Create Table year_test(val year(2)); Query OK, 0 rows affected, 1 warning (0.23 sec) mysql> insert into year_test(val) values('70'); Query OK, 1 row affected (0.14 sec) mysql> insert into year_test(val) values('00'); Query OK, 1 row affected (0.06 sec) mysql> select * from year_test; +------+ | val | +------+ | 70 | | 00 | +------+ 2 rows in set (0.00 sec) mysql> select * from year_test where val = '1970'; +------+ | val | +------+ | 70 | +------+ 1 row in set (0.03 sec) mysql> select * from year_test where val = '2000'; +------+ | val | +------+ | 00 | +------+ 1 row in set (0.00 sec) mysql> select * from year_test where val = '1900'; Empty set (0.06 sec)
It is uncertain that with which year we connote, ‘1900’ or ‘2000’, by storing 00 to ‘val’. MySQL is interpreting it as year 2000.
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