Microsoft SQL Server Column Function

I'm trying to set the default value in a table I'm creating to:
(dateadd(s,TotalTime*60, StartTime))

Where TotalTime is another column and is a Real.
And StartTime is another column and is a DateTime.

Syntax help please.

Thanks,
Ni
KnightWhoSaysNiAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

micropc1Commented:
I don't believe that's possible since SQL won't let you use field names in the default value.

You'll probably need to create a trigger to handle this. Something like...

CREATE TRIGGER
ON tableName
AFTER INSERT,UPDATE
AS
UPDATE tableName SET dateColumn = dateadd(s,TotalTime*60, StartTime) WHERE primaryKeyField IN (select primaryKeyField from inserted where dateColumn IS NULL)

Open in new window

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Barry CunneyCommented:
A computed column may also be an option - Of course it depends on your requirment
Do you want the field to have a default value that can be overwritten if so desired by an app/users
If not a computed column might be an option
ALTER TABLE yourtable ADD yourcolumn (dateadd(s,TotalTime*60, StartTime))
0
Anthony PerkinsCommented:
As suggested previously you need a computed column, just a minor correction (no points please), for a computed column the AS is required as in:
ALTER TABLE yourtable ADD yourcolumn AS (DATEADD(s,TotalTime * 60, StartTime))
0
micropc1Commented:
Yes - as bcunney said, It depends on your requirement. Since you said you want to set a "default" value I assume you're wanting to be able to insert data into the column.  You can't insert data into a computed column using an INSERT or UPDATE statement. If that's what you want you'll need a trigger. If you don't need to insert data then the computed column is the better and simpler option.
0
KnightWhoSaysNiAuthor Commented:
Thanks for the input.  I think either solution provided would resolve the issue, but I went a little different direction.

I decided to use a stored procedure to perform the insert and declare the calculated variables in the stored procedure.

BEGIN TRY
      DECLARE @StartTime datetime;
      DECLARE @EndTime datetime;
      SET @EndTime = GETDATE();
      SET @StartTime = DATEADD(SS,@TotalTime*-60,@EndTime);
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft SQL Server

From novice to tech pro — start learning today.