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How many digits should be there in string or number so that it can be specified as a date value by MySQL?
While considering the year as 4-digit value, minimum of 8 digits in a string or number is required for MySQL to specify it as a date value. In this case, if we also want to store microseconds then the value can be up to a maximum of 20 digits.
mysql> Select TIMESTAMP('20171022040536.100000');
+-----------------------------------+
| TIMESTAMP('20171022040536100000') |
+-----------------------------------+
| 2017-10-22 04:05:36.100000 |
+-----------------------------------+
1 row in set, 1 warning (0.00 sec)The query above is taking 20 digits string for TIMESTAMP value. Last 6 digits are for microseconds.
mysql> Select TIMESTAMP(20171022); +---------------------+ | TIMESTAMP(20171022) | +---------------------+ | 2017-10-22 00:00:00 | +---------------------+ 1 row in set (0.00 sec)
The query above is taking 8 digits string for TIMESTAMP value.
mysql> Select TIMESTAMP(201710); +-------------------+ | TIMESTAMP(201710) | +-------------------+ | NULL | +-------------------+ 1 row in set, 1 warning (0.00 sec)
The query above returns NULL because the numbers of a digit are less than 8.
In contrast, while considering the year as 2-digit value, minimum of 6 digits in a string or number is required for MySQL to specify it as a date value. In this case, if we also want to store microseconds then the value can be up to a maximum of 18 digits.
mysql> Select TIMESTAMP(171022); +---------------------+ | TIMESTAMP(171022) | +---------------------+ | 2017-10-22 00:00:00 | +---------------------+ 1 row in set (0.00 sec)
The query above is taking 6 digits string for TIMESTAMP value.
mysql> Select TIMESTAMP('171022040536.200000');
+----------------------------------+
| TIMESTAMP('171022040536.200000') |
+----------------------------------+
| 2017-10-22 04:05:36.200000 |
+----------------------------------+
1 row in set (0.00 sec)The query above is taking 18 digits string for TIMESTAMP value. Last 6 digits after dot (.) are for microseconds.
mysql> Select TIMESTAMP(1710); +-----------------+ | TIMESTAMP(1710) | +-----------------+ | NULL | +-----------------+ 1 row in set, 1 warning (0.00 sec)
The query above returns NULL because the numbers of digit are less than 6.
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