Incorrect sum in an aggregate function

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SQL-Server-2012

I have the an issue with SQL giving wrong sums with the query,

SQL

select GL, sum(TotalFuel) as "tf" from fueltable1 where [TransDate] > '3/1/2015 12:00:00 AM' and [TransDate] < '4/1/2015 12:00:00 AM' group by GL

If I sum the table fueltable1 I get 10405.63, but this results in a total of 9934.36.
Any ideas?

Posted 26-Aug-15 8:40am

jhoga

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PIEBALDconsult 26-Aug-15 14:44pm

Floating point limitations? What datatype is TotalFuel ?

jhoga 26-Aug-15 14:47pm

Decimal(18,2)

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Wendelius · Accepted Answer · 2015-08-26T08:55:00

The likeliest reason is that the conditions are eliminating rows from aggregation. For example should either one of the TransDate conditions include equality, for example

SQL

where [TransDate] >= '3/1/2015 12:00:00 AM'
and [TransDate] < '4/1/2015 12:00:00 AM'

Another thing is that you're relying on the implicit date conversion. In worst case dates and months switch places so I'd suggest using CONVERT(date, '3/1/2015', 101) (or whatever is the correct format for you)

If neither of these reveal the reason, then checking the individual rows would be in place. Instead of grouping the data, select the source data, save it to excel and check if there is a difference.