I have a table set up that contains a column of DECIMAL(15,12) -- financial data, where the precision is highly important. I am building up a series of SQL statements, and I noticed that when doing SUM() on this decimal column, I get a strange rounding error (see below), and was hoping that someone out there can help me with this.
My recent test involved the following three values from the column: 2.4950 2.5950 2.7700 (Chosen, for this example, as they are precise at few decimal places).
When I use a SUM() on these I get: 7.860
If I switch the column over to a FLOAT, then the SUM() becomes 7.8599998950958
Using Excel to test the numbers, or hand-calculating, I get: 7.8550.
Shouldn't the SUM() remain with the precision of the DECIMAL type and not try to round to 2 decimal places?
Anyway, any help is appreciated.
Martin
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