Question

How do i combine 2 column using SQL server 2005 ?

Problem is that The DateTime is stored in 1 column and the milliseconds is stored in another column.

I want to add the Milliseconds onto DateTime column to give it a more accurate DateTime.

I need to use this DateTime to query record accurate to milliseconds.

Any idea?

I need to replace DateTime with the added values.

SELECT * 
FROM TABLENAME 
WHERE [DateTime] >= '2011-04-12 12:00:00 AM'
AND [DateTime] <= '2011-05-25 3:35:04 AM'

and run the query.

Answer 1

Well, first solve your problem:

SELECT DATEADD(millisecond,<milliscolumn>,<datetimecolumn>) from <table>

And then file a bug report that these should just be stored in one column anyway.

---

You can do this, based on your sample query, but note that this destroys the possibility of the server being able to use an index:

SELECT * FROM TABLENAME WHERE
    DATEADD(millisecond,[MillisecondColumn],[DateTime]) between
        '2011-04-12T12:00:00' AND '2011-05-25T03:35:04'

If this is a large table, then indexes may be important. If you can’t alter whatever’s populating this data, you might want to add this calculation as a persisted computed column to this table, and then index and query against that.

Note that I’ve replaced your two comparisons with a single BETWEEN, and also adjusted the datetime strings so that they’re not affected by regional settings.