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2025-09-22 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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GETDATE (): get the current date and time
DATEADD (datepart, number, date) to calculate the date after the increase. Parameter date is the date to be calculated; parameter number is increment; parameter datepart is the unit of measurement. For optional values, please see remarks.
DATEADD (DAY, 3 ~ date) is the date after the calculation date date3, while DATEADD (MONTH,-8 ~ ~ date) is the date before the calculation date date8
DATEDIFF (datepart, startdate, enddate): calculates the difference between two dates. Datepart is the unit of measurement, and the available value is referred to DateAdd.
Count the number of employees with different seniority:
Select DateDiff (year,FInDate,getdate ()), count (*) from T_Employee group by DateDiff (year,FInDate,getdate ())
DATEPART (datepart,date): returns a specific part of a date
The function of common date function
GETDATE () gets the current time of the system
DAY () gets the number of days in a date
MONTH () gets the month of a date
YEAR () gets the year in a date
DateDiff (date element, date 1, date 2) finds the difference between the date elements of two dates
DateName (date element, date) returns a date element as a character
DatePart (date element, date) returns the date element as an integer
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