What would be output if we will try to extract time values by providing the date values only to MySQL EXTRACT() function?

When we try to extract hour value from a date, then EXTRACT() function will give the output 0 with a warning as shown in the below-given example −

mysql> Select EXTRACT(Hour from '2017-10-20');

+---------------------------------+
| EXTRACT(Hour from '2017-10-20') |
+---------------------------------+
| 0                               |
+---------------------------------+
1 row in set, 1 warning (0.00 sec)

mysql> Show Warnings;

+---------+------+----------------------------------------------+
| Level   | Code | Message                                      |
+---------+------+----------------------------------------------+
| Warning | 1292 | Truncated incorrect time value: '2017-10-20' |
+---------+------+----------------------------------------------+
1 row in set (0.00 sec)

Now, when we try to extract minute value from a date, then EXTRACT() function will give the value of century from date as the output with a warning as shown in the below-given example −

mysql> Select EXTRACT(Minute from '2017-10-20');
+-----------------------------------+
| EXTRACT(Minute from '2017-10-20') |
+-----------------------------------+
| 20                                |
+-----------------------------------+
1 row in set, 1 warning (0.00 sec)
mysql> Show Warnings;
+---------+------+----------------------------------------------+
| Level   | Code | Message                                      |
+---------+------+----------------------------------------------+
| Warning | 1292 | Truncated incorrect time value: '2017-10-20' |
+---------+------+----------------------------------------------+
1 row in set (0.00 sec)

Now, when we try to extract seconds value from a date, then EXTRACT() function will give the value of year as the output with a warning as shown in the below given example −

mysql> Select Extract(Second from '2017-10-20');

+-----------------------------------+
| Extract(Second from '2017-10-20') |
+-----------------------------------+
| 17                                |
+-----------------------------------+
1 row in set, 1 warning (0.00 sec)

mysql> Show Warnings;

+---------+------+----------------------------------------------+
| Level   | Code | Message                                      |
+---------+------+----------------------------------------------+
| Warning | 1292 | Truncated incorrect time value: '2017-10-20' |
+---------+------+----------------------------------------------+
1 row in set (0.00 sec)

We will get similar results on trying to get the time values(Hour, Minute & Seconds) from current date i.e. by using Curdate() at the place of date.