SECOND

PostgreSQL equivalent:

Returns the seconds of a time.

MySQL 8.4

SECOND(time)

Return value

An integer from 0 to 59; fractional seconds are dropped; NULL if the value is not recognized

MySQL 8.4

SELECT SECOND('2022-06-16 16:37:03');

SECOND('2022-06-16 16:37:03')
3

MySQL 8.4

SELECT SECOND('16:37:03.75');

SECOND('16:37:03.75')
3