How To Calculate Dates - SQL Server Forums

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How To Calculate Dates

Author

Topic

cnbhold
Starting Member

43 Posts

Posted - 2010-12-01 : 15:55:10

I have a table with a DateStamp Column. How would I calculate the number of days between the date in the column and todays date. Then update the DaysPastDue with number of days that have past.

Sample Table Name: Payments

CustomerID int Primary Key,
FirstName varchar(50),
LastName varchar(50),
DueDate DateTime,
DaysPastDue Int

Angel

webfred
Master Smack Fu Yak Hacker

8781 Posts

Posted - 2010-12-01 : 16:19:35

Why do you want to store DaysPastDue?
If you are calculating the days today then tomorrow the result will be wrong.
Why not calculating DaysPastDue whenever you need it without storing it?

No, you're never too old to Yak'n'Roll if you're too young to die.

webfred
Master Smack Fu Yak Hacker

8781 Posts

Posted - 2010-12-01 : 16:30:37

Or use a COMPUTED COLUMN:

create table Payments(
CustomerID int identity(1,1),
FirstName varchar(50),
LastName varchar(50),
DueDate DateTime,
DaysPastDue as datediff(day,DueDate,dateadd(day,datediff(day,0,getdate()),0))
)

No, you're never too old to Yak'n'Roll if you're too young to die.

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2010-12-01 : 16:45:19

DaysPastDue AS datediff(day, DueDate, getdate())

will suffice

N 56°04'39.26"
E 12°55'05.63"

webfred
Master Smack Fu Yak Hacker

8781 Posts

Posted - 2010-12-01 : 16:47:44