add 30 days before trigger date programatically?

this is my query
SELECT ID, Contractname, triggerdate, Amount, ClientID FROM legalcontract
triggerdate is the date where we need to follow up to client for possible renewal.   i want to add to my query a field called 30days  which is 30 days before the triggerdate.  

how can u add that programmaticaly in tsql?
LVL 1
gianitooAsked:
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sphillips1971Commented:
You can pass a negative to the DATEADD function to perform a date subtraction:

SELECT DATEADD(day, -30, triggerdate) AS 30days
FROM legalcontract

Scott
0
gianitooAuthor Commented:
can my query look like this  
SELECT ID, DATEADD(day, -30, triggerdate) AS 30days, triggerdate,Contractname, startdate, enddate, Amount, ClientID FROM legalcontract
0
sphillips1971Commented:
Yes, you can add that as a column anywhere in your SQL

Scott
0

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Scott PletcherSenior DBACommented:
I know the answer has already been accepted but you want still want to consider this approach :-) ...

I suggest using a computed, or virtual, column.  This will keep the column definition in the table itself and not in any particular SELECT.  First, you add the column definition once to the table:

ALTER TABLE legalcontract
ADD notifydate AS DATEADD(DAY, -30, triggerdate)

Then you can SELECT it just like any other column.  For example:

SELECT ID, Contractname, notifydate, Amount, ...
FROM legalcontract
WHERE notifydate ...
ORDER BY notifydate
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Microsoft SQL Server 2005

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