The SUMPRODUCT function is the most versatile in Excel.

It can be used to do multicolumn sorts by array (with no human intervention or VBA required).

It can determine if a number is prime.

It can coerce bitwise operations in integers (i.e. bitwise logical AND, OR, XOR, IMP, EQ, and NOT).

It can be used to supercharge lookup tables with bitmasks.

It can find the dot product of two vectors.

It can do the database calculations you addressed in this post and has the massive advantage over SUMIF and COUNTIF (and the Excel 2007 SUMIFS and COUTNIFS) that it can handle OR clauses in the criteria.

It can replace most any Array-Entered Formula that uses SUM, and is usually about 10% faster.

This list could go on for pages…

I have a very detailed post on my blog:

http://www.excelhero.com/blog/2010/01/the-venerable-sumproduct.html

Regards,

Daniel Ferry
excelhero.com/blog

Sumproduct is great. I used to struggle to add multipple criteria up in my spreadsheets, and then someone from UtterAccess.com taught me about Sumproduct. I can’t thank that person enough.

Anyway…many articles to catch up on. Keep up the outstanding work.

My preference is to use =SUMPRODUCT(1*(A1:A10… instead of =SUMPRODUCT(–(A1:A10=
As it is easier to read, especially for those not so familiar with formulas.

;o))) there is no use of SUMPRODUCT ….

just you have to name some ranges
ResDat =Hours!$B$1:$A$Z1 ( ie for 52 dates)
ResNam =Hours !$A$2:$A$1000 ( ie for 1000 names)

in Variance!B2 put this formula
=SUMIF(WBK1!resDat,”<="&$A$10,INDIRECT("hours!"&ADDRESS(1+MATCH(A2,WBK1!resNam,0),2)&":"&ADDRESS(1+MATCH(A2,WBK1!resNam,0),52)))

and pull it down as many time as ressource names
beware :
dateref of calculation is absolute $A$10
current ressource name is relative : A2

WBK1 is actual Workbook.name

HTH
;o)))

Also make sure the INDIRECT is wrapped in ()s to avoid any confusion.

I am essential developing a variance tool on the variance tab.

I have a list of employees on the hours tab and the rests of the actual hours that they have worked by dated column.

I am trying to write a formula that totals all of the hours for a single employee based on a given date. See example at the end.

These formulas work as a stand alones:

=ADDRESS(MATCH(A10,Hours!$M$621:$M$725,0)+ROWS(Hours!$L$1:$L$620),MATCH($C$2,Hours!$620:$620),4,1,”Hours”)

=SUMPRODUCT(–(Hours!M621:M725=A10)*Hours!$N$621:$BZ$725)

BUT, when I try to combine the two to get the date variability like I want, Excel says my formula contains an error. Here is what the formula looks like:

=SUMPRODUCT(–(Hours!M621:M725=A10)*Hours!$N$621:ADDRESS(MATCH(A10,Hours!$M$621:$M$725,0)+ROWS(Hours!$L$1:$L$620),MATCH($C$2,Hours!$620:$620),4,1,”Hours”))

Doughnuts all around for anyone who can help me on this one! I suspect that I have a syntax issue in my formula but not sure.

Example:

Variance Tab
As of: 11/28/2009

Resource Total hours worked Answer should be
Billy 130
Bob Formula 50
Joe goes 80
An here 90
Jill 160

Hours Tab

Resource 11/14/2009 11/28/2009 12/12/2009
Billy 40 90 30
Bob 30 20 80
Joe 50 30 80
An 80 10 40
Jill 80 80 50