Suppose if we store a date value "0000-00-00" in a MySQL table, then MySQL will return 0 when extracting the year value from such a date. It will not be in Year(2) or Year(4) format. To understand it, we use the following data from the "detail_bday" table -
mysql> Select * from detail_bday; +----+---------+------------+ | Sr | Name | Birth_Date | +----+---------+------------+ | 1 | Saurabh | 1990-05-12 | | 2 | Raman | 1993-06-11 | | 3 | Gaurav | 1984-01-17 | | 4 | Rahul | 1993-06-11 | | 5 | Sonia | 1993-11-31 | | 6 | Ram | 0000-00-00 | +----+---------+------------+ 6 rows in set (0.00 sec)
Now the following query will try to get the year value from the date "0000-00-00" -
mysql> Select Year(Birth_date) from detail_bday Where Name = 'Ram'; +------------------+ | Year(Birth_date) | +------------------+ | 0 | +------------------+ 1 row in set (0.00 sec)
The above result The set shows that MySQL returns 0 instead of giving the value in Year(2) or Year(4) format.
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