SQL Standard allows dates to be subtracted. We specify the unit
and the number of digits of the result answer:
YEAR MONTH DAY HOUR MINUTE SECOND
We want to know how long has it been since Tom Jones featured on TOTP.
|Specific to MySQL|
|We may use the TO_DAYS function which tells use how many
days since year 0.|
See 6.3.4 Date and Time Functions for more details.