I'm going to check again when I get back there tomorrow.
But thanks :)
Martin
Dan Nelson wrote:
In the last episode (Feb 21), Martin said:
Version: Using 4.1.10 on WinXP pro, currently interacting with it using the Query Browser for testing.
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.
You hand calculations (and Excel) are wrong, apparently. Here's my hand-calculation:
1 11 1
2.495 5.090 + 2.595 + 2.770 ======= ======= 5.090 7.860
, which matches MySQL's results.
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