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Derive single datetime2 from separate date and time columns

Posted on 2011-02-25
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Last Modified: 2012-05-11
I am importing a vast amount of data into Sql Server with SSIS.  In the input data, which is in CSV format, there are separate date and time columns.  The time has millisecond precision. I want to derive a single datetime2 output column.  
I have tried in SSIS to use the derived column transformation as follows:
(DT_DBTIME2,3)[Date]+ (DT_DBTIME2, 3) [Time]
But this cannot be evaluated.

Does anyone have an idea how to simply derive a single datetime2 column from separate input date and time columns in a CSV?  

I thought of casting date and time as strings, concatenating them with a space, and then casting the result as a datetime2(3) column.  This seems inelegant and slow however.  Any better approaches?
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Question by:gnf
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6 Comments
 
LVL 17

Expert Comment

by:dbaSQL
ID: 34981832
You're going to need to concatenate the two values, and I'm pretty sure you can just do this with a derived column.  

Add the 'Derived Column' transform to your data flow tab, then double-click it.

Drived column name     whatever you want the new column to be named
Drived Column             choose the 'Add as new field' option
Expression                [datefield1]  + " "  + [datefield2]      
Datatype                   Database Date

Remember, the expression is case sensitive.
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Accepted Solution

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gnf earned 0 total points
ID: 34983298
I had hoped there would be a better solution than concatenating strings but maybe there isn't.  I use a regular expression in SSIS as follows:

(DT_DBTIMESTAMP2,3)(SUBSTRING([Date],1,4) + "-" + SUBSTRING([Date],5,2) + "-" + SUBSTRING([Date],7,2) + " " + [Time])
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LVL 17

Expert Comment

by:dbaSQL
ID: 34983358
Well, there may be another way, but the concatenated value is what I am familiar with.
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Author Comment

by:gnf
ID: 35010346
Question closed
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Author Comment

by:gnf
ID: 35010350
Closed question.
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Author Closing Comment

by:gnf
ID: 35045627
Wished there was a cleaner way, but it seems there isn't.  Have to concatenate strings.
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