Question - I have a so-called 'database' of about 15000 rows of data. From
the so-called 'database' I am performing sumproduct type computations. I do
not believe I can use the countif function since I am looking at either 2 or
3 columns of data to extract the proper value (e.g. I can not use countif x
+/- countif y +/- countif z). My question is this - Does the sumproduct
function take a long time to perform calculations? Here are a few of my
formulas

=SUMPRODUCT(('Jan Database'!$C$2:$C$19992=C15)*('Jan
Database'!$P$2:$P$19992=TRUE))

=SUMPRODUCT(('Jan Database'!$C$2:$C$19992=C15)*('Jan
Database'!$P$2:$P$19992=TRUE)*('Jan Database'!$Q$2:$Q$19992))

=SUMPRODUCT(('Jan Database'!$C$2:$C$19992=C15)*('Jan
Database'!$P$2:$P$19992=TRUE)*('Jan Database'!$K$2:$K$19992))

These are all working properly, just a little slow for the user.