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:
> (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
> Using Excel to test the numbers, or hand-calculating, I get:
You hand calculations (and Excel) are wrong, apparently. Here's my
1 11 1
+ 2.595 + 2.770
, which matches MySQL's results.