The SEC_TO_TIME() function calculates a time expression from the given number of "Seconds".
The "Seconds" argument can be a decimal number containing the microseconds.
If the decimal places for the microseconds of the "Seconds" argument are longer than 6, they are truncated.
If the value of the argument is invalid, a time value of 00:00:00.000000 is returned.
If the value of "Seconds" is NULL, the SEC_TO_TIME() function returns NULL.