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Compare time stamps in MSSQL

Posted on 2009-03-30
7
1,316 Views
Last Modified: 2012-05-06
1. I have to compare a timestamp field against a static (hardcoded time stamp) . Can u please advice.
eg Timestamp_fied > '2009-03-22 00:00:00.000'  sometin lik this but i don get the correct values.

2. I also would like to dynamically compare the same timestamp field againsnt the current timestamp minus n days
eg Timestamp_fied > current_timestamp-1 ,sometin lik this but i don get the correct values.
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Comment
Question by:FranklinRaj22
7 Comments
 
LVL 26

Expert Comment

by:Chris Luttrell
ID: 24024095
If you are refering to a column with the DATA_TYPE of TIMESTAMP then it is not a date value.  See http://msdn.microsoft.com/en-us/library/ms182776(SQL.90).aspx for more details on TIMESTAMP.  Comparing your string to a column of type DATETIME works for me so your problem must be TIMESTAMP.
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LVL 9

Expert Comment

by:tl121000
ID: 24024137
How about casting the static timestamp in question?
SELECT *
where timestamp_field > CAST('2009-03-22 00:00:00.000'  AS TIMESTAMP(0) FORMAT 'DD/MM/YYYYBHH:MI:SS');

0
 
LVL 3

Expert Comment

by:csenasa
ID: 24025897
Hi,
U can perform mathematical operations on Timesatmp in MSSQL.

Adding dates and subtracting dates can be achieved like simple addition.
< , > <= , >= and != can be use for comparinson also.

select Current_TIMESTAMP - 1
select Current_TIMESTAMP - 1 day
select Current_TIMESTAMP +  10 day
select Current_TIMESTAMP - 1 month
 
 
SELECT * FROM
NyTable WHERE MyDate > = GETDATE()
 
SELECT * FROM
NyTable WHERE MyDate > = Current_TIMESTAMP - 1 month

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LVL 3

Accepted Solution

by:
csenasa earned 500 total points
ID: 24025918
Hi
U can use system functions like Dateadd() and DateDiff()
SELECT DATEADD(day, 3, GETDATE());
 
GO
SELECT DATEADD(day, 3, DueDate)
FROM Sales.SalesOrderHeader;
GO
 
SELECT interval = DATEDIFF(month,  'Nov 30 2001' , GETDATE())
 
GO
SELECT interval = DATEDIFF(month, DueDate, 'Nov 30 2001')
FROM Sales.SalesOrderHeade

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Author Comment

by:FranklinRaj22
ID: 25390192
ok
0
 
LVL 26

Expert Comment

by:Chris Luttrell
ID: 25390235
ok?  What does that mean after all this time?  Did one of the comments help you, if so please reward that answer.  If you still have problems or questions let us know so we can try to help.
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