Solved

ms sql + update datetime entry

Posted on 2011-03-14
4
294 Views
Last Modified: 2012-06-27
I have a bunch of dates that entered in a table incorrectly, for March 11th, 2011, it entered 11/3/2011, is there a way to update these entries with and update statement, but only changing the date part and keeping the time part the same, as each entry has a time as well as the date.
0
Comment
Question by:dkilby
  • 2
  • 2
4 Comments
 
LVL 92

Expert Comment

by:Patrick Matthews
ID: 35130303
If you ONLY want to take the entries where the date portion is 2011-11-03 and cast them back to 2011-03-11...



CREATE TABLE #foo (Dt datetime)

INSERT INTO #foo (Dt) VALUES ('2011-01-15 11:22:33')
INSERT INTO #foo (Dt) VALUES ('2011-03-10 19:47:01')
INSERT INTO #foo (Dt) VALUES ('2011-07-15 11:22:33')
INSERT INTO #foo (Dt) VALUES ('2011-11-03 06:30:00')

SELECT Dt FROM #foo ORDER BY Dt

UPDATE #foo
SET Dt = DATEADD(day, DATEDIFF(day, '2011-11-03', '2011-03-11'), Dt)
WHERE Dt >= '2011-11-03' AND Dt < '2011-11-04'

SELECT Dt FROM #foo ORDER BY Dt

DROP TABLE #foo

Open in new window

0
 

Author Comment

by:dkilby
ID: 35130866
I have a lot of rows, do i have to insert each row into the temp table one row at a time?
0
 
LVL 92

Accepted Solution

by:
Patrick Matthews earned 500 total points
ID: 35131002
No, that was just a demonstration.  You can simply use this, substituting the actual table/column names:

UPDATE [TableName]
SET [DateColumn] = DATEADD(day, DATEDIFF(day, '2011-11-03', '2011-03-11'), [DateColumn])
WHERE [DateColumn] >= '2011-11-03' AND [DateColumn] < '2011-11-04'

Open in new window

0
 

Author Closing Comment

by:dkilby
ID: 35131196
thank you
0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Why is this different from all of the other step by step guides?  Because I make a living as a DBA and not as a writer and I lived through this experience. Defining the name: When I talk to people they say different names on this subject stuff l…
Slowly Changing Dimension Transformation component in data task flow is very useful for us to manage and control how data changes in SSIS.
Using examples as well as descriptions, and references to Books Online, show the documentation available for datatypes, explain the available data types and show how data can be passed into and out of variables.
Viewers will learn how to use the INSERT statement to insert data into their tables. It will also introduce the NULL statement, to show them what happens when no value is giving for any given column.

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question