Beginning Microsoft SQL Server 2008 ... - S3 Tech Training

Appendix A: System Functions
CURRENT_TIMESTAMP
The CURRENT_TIMESTAMP function simply returns the current date and time as a datetime type. It is
equivalent to GETDATE(). The syntax is as follows:
CURRENT_TIMESTAMP
DATEADD
The DATEADD function adds an interval to a date and returns a new date. The syntax is as follows:
DATEADD(, , )
The datepart argument specifies the time scale of the interval (day, week, month, and so on) and may
be any of the dateparts recognized by SQL Server. The number argument is the number of dateparts that
should be added to the date.
DATEDIFF
The DATEDIFF function returns the difference between two specified dates in a specified unit of time (for
example: hours, days, weeks). The syntax is as follows:
DATEDIFF(, , )
The datepart argument may be any of the dateparts recognized by SQL Server and specifies the unit of
time to be used.
DATENAME
The DATENAME function returns a string representing the name of the specified datepart (for example:
1999, Thursday, July) of the specified date. The syntax is as follows:
DATENAME(, )
DATEPART
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The DATEPART function returns an integer that represents the specified datepart of the specified date.
The syntax is as follows:
DATEPART(, )
The DAY function is equivalent to DATEPART(dd, ); MONTH is equivalent to DATEPART(mm,
); YEAR is equivalent to DATEPART(yy, ).