Check out example codes for "date_part mysql". It will help you in understanding the concepts better.
Code Example 1
mysql> SELECT EXTRACT(YEAR FROM '2019-07-02');
-> 2019
mysql> SELECT EXTRACT(YEAR_MONTH FROM '2019-07-02 01:02:03');
-> 201907
mysql> SELECT EXTRACT(DAY_MINUTE FROM '2019-07-02 01:02:03');
-> 20102
mysql> SELECT EXTRACT(MICROSECOND
-> FROM '2003-01-02 10:30:00.000123');
-> 123
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