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----------------------------------Vertica--------------------------------------------------------------------------------------------------------

select

datediff('year',    '1988-06-21', Now()) as YearsBetweenDates,
datediff('quarter', '1988-06-21', Now()) as QuartersBetweenDates,
datediff('month',   '1988-06-21', Now()) as MonthsBetweenDates,
datediff('day',     '1988-06-21', Now()) as DaysBetweenDates,
datediff('hour',    '1988-06-21', Now()) as HoursBetweenDates,
datediff('minute',  '1988-06-21', Now()) as MinutesBetweenDates,
datediff('second',  '1988-06-21', Now()) as SecondsBetweenDates,


timestampdiff('year',   '2015-08-22', Now()) as YearsBetween,
timestampdiff('month',  '2015-08-22', Now()) as MonthsBetween,
timestampdiff('week',   '2015-08-22', Now()) as WeeksBetween,
timestampdiff('day',    '2015-08-22', Now()) as DaysBetween,
timestampdiff('hour',   '2015-08-22', Now()) as HoursBetween,
timestampdiff('minute', '2015-08-22', Now()) as MinutesBetwee


----------------------------------SQL Server-----------------------------------------------------------------------------------------------------

select

datediff(year,    '1988-06-21', getdate()) as YearsBetweenDates,
datediff(quarter, '1988-06-21', getdate()) as QuartersBetweenDates,
datediff(month,   '1988-06-21', getdate()) as MonthsBetweenDates,
datediff(day,     '1988-06-21', getdate()) as DaysBetweenDates,
datediff(hour,    '1988-06-21', getdate()) as HoursBetweenDates,
datediff(minute,  '1988-06-21', getdate()) as MinutesBetweenDates,
datediff(second,  '1988-06-21', getdate()) as SecondsBetweenDates

DaysBetween |YearsBetweenDates |QuartersBetweenDates |MonthsBetweenDates |DaysBetweenDates |HoursBetweenDates |MinutesBetweenDates |SecondsBetweenDates |
------------|------------------|---------------------|-------------------|-----------------|------------------|--------------------|--------------------|
10764       |29                |117                  |353                |10764            |258357            |15501421            |930085304           |

#------------------------------------MySQL----------------------------------------------------------------------------------------------------------

select

datediff(Now(), '1988-06-21') as DaysBetween,

timestampdiff(year,    '1988-06-21', Now()) as YearsBetweenDates,
timestampdiff(quarter, '1988-06-21', Now()) as QuartersBetweenDates,
timestampdiff(month,   '1988-06-21', Now()) as MonthsBetweenDates,
timestampdiff(day,     '1988-06-21', Now()) as DaysBetweenDates,
timestampdiff(hour,    '1988-06-21', Now()) as HoursBetweenDates,
timestampdiff(minute,  '1988-06-21', Now()) as MinutesBetweenDates,
timestampdiff(second,  '1988-06-21', Now()) as SecondsBetweenDates

DaysBetween |YearsBetweenDates |QuartersBetweenDates |MonthsBetweenDates |DaysBetweenDates |HoursBetweenDates |MinutesBetweenDates |SecondsBetweenDates |
------------|------------------|---------------------|-------------------|-----------------|------------------|--------------------|--------------------|
10764       |29                |117                  |353                |10764            |258357            |15501421            |930085304           |

------------------------------------PostgreSQL---------------------------------------------------------------------------------------------------------

select

age(Now(), '1988-06-21') as YearsBetweenDates

yearsbetweendates                                      |
-------------------------------------------------------|
29 years 5 mons 19 days 21 hours 0 mins 39.466046 secs |