Counting Unique ID's

[Agent86]

Hi,

I'm wrestling with how to approach this.

I've got a list that's about 15,000 rows long. Column A has a date and column B has an alpha numeric ID. The list is sorted in order of oldest date at the top, most recent at the bottom. The range of dates is from 1/1/2007 through 3/23/2009. Both the same date and ID show up multiple time throughout the list.

I need to figure out how many unique ID's show up on the list in each given calendar month. I could manually break up the list into months, use an advanced filter and then run a count formula, but it seems like there must be an easier approach.

Anyone have any ideas?

 

[Gerald Higgins]

Agent 86, just to be absolutely clear, if your data looked like this

Date.....ID
Feb 1....A1
Feb 2....A1
Feb 2....A1
Feb 3....A2
Mar 1....A2
Mar 3....A3

Is the result you want, 2 for Feb and 2 for March ?

 

[Agent86]

Yes, you're correct.

 

[Gerald Higgins]

Have you considered a pivot table for this ?

 

[Agent86]

No, I never thought of that. I've used pivot tables created by others, but I've never made one myself. I guess that's something I should explore and learn how to work with.

 

[Gerald Higgins]

Sorry Agent86, I tried doing this myself on a pivot table, and I'm struggling a bit - maybe that isn't the best solution.

I'll have a think about other options.

 

[c_m]

After you are done with setting up your pivot table, try to group dates by month and year. To do this:
Right click on date field (the one with drop down button)>>select group and show detail>>group>>select months and year>>select ok
Does that help?

 

[Gerald Higgins]

Agent86, this isn't an ideal solution, there are no doubt more elegant ways to do this.
BUT, I think it does work.

Assuming dates are in Col A, starting on row 2 (with header data on row 1) and IDs are in Col B.
Also assumes, as you said, that your data is already sorted into date order.

Use two helper columns, C and D.

In C2

=MONTH(A2)&YEAR(A2)&B2

and in D2

=IF(COUNTIF(C2:C$2,C2)>1,0,1)

This will basically put a 1 against any ID that has NOT previously appeared that month.
You can then use a simple pivot table to summarise the months and unique IDs.
Use Col A for the "Row Fields" column of the pivot table.
Group this field by month.
Then use Col D for the Data Items field.

I used this data -
<TABLE style="WIDTH: 234pt; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=312 border=0 x:str><COLGROUP><COL style="WIDTH: 72pt; mso-width-source: userset; mso-width-alt: 3072" width=96><COL style="WIDTH: 54pt" span=3 width=72><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 72pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=96 height=17>DATE</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 54pt; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" width=72>ID</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 54pt; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" width=72>helper 1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 54pt; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" width=72> helper 2</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39814">01/01/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A2)&YEAR(A2)&B2">12009a1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C2:C$2,C2)>1,0,1)">1</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39815">02/01/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A3)&YEAR(A3)&B3">12009a1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C3,C3)>1,0,1)">0</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39816">03/01/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a2</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A4)&YEAR(A4)&B4">12009a2</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C4,C4)>1,0,1)">1</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39817">04/01/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a3</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A5)&YEAR(A5)&B5">12009a3</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C5,C5)>1,0,1)">1</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39818">05/01/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A6)&YEAR(A6)&B6">12009a1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C6,C6)>1,0,1)">0</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39819">06/01/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a5</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A7)&YEAR(A7)&B7">12009a5</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C7,C7)>1,0,1)">1</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39845">01/02/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A8)&YEAR(A8)&B8">22009a1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C8,C8)>1,0,1)">1</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39846">02/02/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A9)&YEAR(A9)&B9">22009a1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C9,C9)>1,0,1)">0</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39847">03/02/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a2</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A10)&YEAR(A10)&B10">22009a2</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C10,C10)>1,0,1)">1</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39848">04/02/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a3</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A11)&YEAR(A11)&B11">22009a3</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C11,C11)>1,0,1)">1</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39849">05/02/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a3</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A12)&YEAR(A12)&B12">22009a3</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C12,C12)>1,0,1)">0</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39850">06/02/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a3</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A13)&YEAR(A13)&B13">22009a3</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C13,C13)>1,0,1)">0</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39851">07/02/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a2</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A14)&YEAR(A14)&B14">22009a2</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C14,C14)>1,0,1)">0</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39852">08/02/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A15)&YEAR(A15)&B15">22009a1</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C15,C15)>1,0,1)">0</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl22 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17 x:num="39853">09/02/2009</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">a3</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" x:fmla="=MONTH(A16)&YEAR(A16)&B16">22009a3</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num x:fmla="=IF(COUNTIF(C$2:C16,C16)>1,0,1)">0</TD></TR></TBODY></TABLE>

to give me this pivot table -
<TABLE style="WIDTH: 115pt; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=153 border=0 x:str><COLGROUP><COL style="WIDTH: 84pt; mso-width-source: userset; mso-width-alt: 3584" width=112><COL style="WIDTH: 31pt; mso-width-source: userset; mso-width-alt: 1312" width=41><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: black 0.5pt solid; BORDER-LEFT: black 0.5pt solid; WIDTH: 84pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=112 height=17>Sum of helper 2</TD><TD class=xl28 style="BORDER-RIGHT: black 0.5pt solid; BORDER-TOP: black 0.5pt solid; BORDER-LEFT: black 0.5pt solid; WIDTH: 31pt; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" width=41> </TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: black 0.5pt solid; BORDER-LEFT: black 0.5pt solid; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>DATE</TD><TD class=xl28 style="BORDER-RIGHT: black 0.5pt solid; BORDER-TOP: black 0.5pt solid; BORDER-LEFT: black 0.5pt solid; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent">Total</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl25 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: black 0.5pt solid; BORDER-LEFT: black 0.5pt solid; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Jan</TD><TD class=xl28 style="BORDER-RIGHT: black 0.5pt solid; BORDER-TOP: black 0.5pt solid; BORDER-LEFT: black 0.5pt solid; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>4</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl26 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: black 0.5pt solid; BORDER-BOTTOM: #ece9d8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Feb</TD><TD class=xl29 style="BORDER-RIGHT: black 0.5pt solid; BORDER-TOP: #ece9d8; BORDER-LEFT: black 0.5pt solid; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>3</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl27 style="BORDER-RIGHT: #ece9d8; BORDER-TOP: black 0.5pt solid; BORDER-LEFT: black 0.5pt solid; BORDER-BOTTOM: black 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Grand Total</TD><TD class=xl30 style="BORDER-RIGHT: black 0.5pt solid; BORDER-TOP: black 0.5pt solid; BORDER-LEFT: black 0.5pt solid; BORDER-BOTTOM: black 0.5pt solid; BACKGROUND-COLOR: transparent" align=right x:num>7</TD></TR></TBODY></TABLE>

 

[Gerald Higgins]

c m - thanks for that - I was having a problem getting my Pivot Table to count the unique ID numbers each month.
I've got round this in a fairly clumsy way in my post #8, but I'm sure there are better ways of doing this.

 

[Agent86]

I'm with you, Gerald, and thank you fora all this help.

I've got the dates as the Row Labels and the value returned in column D as Values. So now I've got all the dates on the left and values on the right in the pivot table, but I don't see where I have an option to "group them by month". I'm using version 2007.