Excel Function Help - Compare 2 Cells in Worksheet to 2 Cells in another worksheet, if they match, return value from a different column - excel

Question

I'm wondering if someone would be able to offer some advice on the best way to do this please:
Data in Worksheet # 1
Col A | Col B | Col C
Part-1 | 8 | 2
Part-2 | 7 | 7
Part-7 | 9 | 4
Part-8 | 2 | 6
Data in Worksheet # 2
Col A | Col B | Col C
Part-1 | 8 | *Return value* (If Part-1 is found and 8 matches, return 2)
Part-2 | 7 | *Return value*
Part-3 | 8 | *Return value*
In Worksheet#2 in Cell C2 - I would like to check if the Part-1 in A1 is found in Col A in Worksheet#1. If it is, then I would also like to make sure the Number is B2 in Worksheet#2 matches the Qty in Col B next to the same part#, if both the Part# and Qty match, then i would like to copy across the value from the corresponding cell in Col C in Worksheet#1, to Col C in Worksheet#2. If it does not match, I would like it to return a 0.

Answer 1

Here is the a variation on Reinier's second approach in a form that will work in any version of Excel. You can use references to the specific data ranges, as I have done here, or to entire columns.
=SUM((A2=Sheet1!$A$2:$A$5)*(Sheet2!B2=Sheet1!$B$2:$B$5)*Sheet1!$C$2:$C$5)
This is an array formula, so it needs to be entered with the Control-Shift-Enter combination. It performs the same operation as the SUMPRODUCT. (There are several other ways to do this, such as using MATCH with INDEX or OFFSET.)

Answer 2

Essentially, what you are doing is a lookup based on values in two columns. Looking at it from that angle, you can use a the SUMPRODUCT function, which is supported in any version of Excel. Enter the following in Sheet2, cell C2:
=SUMPRODUCT((Sheet1!$A:$A=$A2)*(Sheet1!$B:$B=$B2)*Sheet1!$C:$C)
Select and drag down the right-bottom corner of C2 to complete column C.
This only works by virtue of the fact that the values in Sheet1, column C, are numbers. It breaks if value pairs in column A and B of Sheet1 occur multiple times, but you did not address that situation in your question in the first place.
For versions 2007 and up, you can use the more convenient function SUMIFS with basically the same approach:
=SUMIFS(Sheet1!$C:$C,Sheet1!$A:$A,$A1,Sheet1!$B:$B,$B1)
Alternatively, you can use a combination of IF and VLOOKUP functions. A formula that will work for Excel 2007 or newer is the following:
=IFERROR(IF(VLOOKUP($A1,Sheet1!$A:$C,2,FALSE)=$B1,VLOOKUP($A1,Sheet1!$A:$C,3,FALSE),0),0)
Older versions of Excel do not support IFERROR, but you can still use a similar approach as explained here.
I have uploaded an example workbook here, which includes an alternative method in column D of Sheet2 as well.