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Calculating the difference in minutes between two datetime columns
I would like to calculate the difference in minutes between two datetime columns. Sometimes there will not be a second datetime for comparison, so I need to handle that. I am currently performing a simple subtraction and storing the result as datetime, which is accurate but yields the result as time since 1900.
Use the DATEDIFF function e.g.
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select datediff(mi,Date1, IsNull(Date2, Date1)) from Table1
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