>>>>>>Hi,
>>>>>>
>>>>>>How do you SUM number of days difference between two DateTime type fields as following:
>>>>>>
>>>>>>
>>>>>>select SUM( DATETIME1 - DATETIME2) AS NUMDAYS
>>>>>>
>>>>>
>>>>>SELECT SUM(DATEDIFF(dd, Date1, Date2)) AS NumDays
>>>>>
>>>>
>>>>Borislav,
>>>>
>>>>I am trying to understand the DATEDIFF() function better. Do I understand correctly that the 1st parameter "dd" really has no literal meaning? That is, you can name this parameter anything and it won't change the result?
>>>
>>>It has, it means days :-)
>>>As Naomi said it means we wand to get difference in days. Check BOL to see the other values of the first parameter.
>>
>>Yes, this is what I did (after posting the question instead of before :)); I read about DATEDIFF() in BOL and it all is clear now.
>>
>>Thank you.
>
>
>BTW the same abbreviations are valid for DATEADD() also :-)
I happened to find the page on comparison of DATEDIFF() and DATEADD() too. Thank you.
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