How Can You Fix - Count unique values?

Count unique values

I've looked thru the boards and can't seem to find a resolution to my query....
I'm trying to count the number of unique records in Column C depending on the value in Column A.
For example....my data consists of the following
 
Vendor Number (Column A)                       Payment Amount (Column B)                                Check Number (Column C)                     Check Date (Col D)
12345                                                            $500.00                                                                 600542                                                     1/14/13
45678                                                            $300.00                                                                 600859                                                     1/21/13
12345                                                            $350.00                                                                 600542                                                     1/14/13
12345                                                            $700.00                                                                 650001                                                     2/15/13
45678                                                            $650.00                                                                 600954                                                     1/28/13
45678                                                            $587.00                                                                 600954                                                     1/28/13
45678                                                            $305.00                                                                 650057                                                     2/20/13
 
I'd like to get a count of the total number of checks written to vendor 12345.
Based on the information above....the answer I'm looking for is 2.
Similarly....if I look at vendor 45678....the answer I'm looking for is 3.
 
Additionall, how can the formula be further expanded to determine the count of checks written to 12345 between 1/1/13 and 1/31/13?
 
Thanks
 
Brian

Solutions to the Problem Count unique values

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@JLLatham;

Given the data laid out as per your image, wouldn't a SUMPRODUCT(/COUNTIF()) be sufficient for a unique count?

For F2 (then copy down),
=SUMPRODUCT(($A$2:$A$99=$E2)/COUNTIF($C$2:$C$99,$C$2:$C$99&""))

For H5 (then copy down),
=SUMPRODUCT(($D$2:$D$99>=$F5)*($D$2:$D$99<=$G5)*($A$2:$A$99=$E2)/COUNTIF($C$2:$C$99,$C$2:$C$99&""))

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To manually repair your Windows registry, first you need to create a backup by exporting a portion of the registry related to MACHINE_CHECK_EXCEPTION (eg. Windows Operating System):

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