Sequential number problem

[Wally]

Hello everyone,
My first post here, I hope I explain everything well.
I have a large spread sheet, 1500 rows and 18 columns(DataSheet). On a seperate work sheet(View) in B1 and C1 I have two values, I want to extract the rows of data where B1(View) = column B(DataSheet) and C1(View) = Column G(DataSheet).
So I have gone to AA and put in a simple If function with an AND, and copied this down, where I get a match it copies the row of data and if not it remains blank.
I would now like to go back to the View sheet and take the relevent data there through a vlookup. To do this I would need to enter a number in column Z next to a row that only contains data in AA, if(AA1<>"",NUMBER,"").
The problem is what to enter to get NUMBER. I want the number to be sequential, the first row with data to be 1, the second row to be 2 etc. Of course the first row might be row 172 and the second one row 844.
This is probably a scrappy way of doing it, but with my limited knolwedge it's the best I can come up with.

Thank you in advance to everyone who views this, it's probably hard to get your head around and I've explained it as best I can.

Wally

[NBVC]

I would add a helper column in the DataSheet first.

In a new column, say column H, in H2 enter formula like:

=IF(AND(B2=View!$B$1,G1=View!$C$1),COUNT(H$1:H1)+1,"")

and copy it down. This will identify and number the matches.

Then in the View sheet, in A2 enter formula:

=IFERROR(INDEX(DataSheet!A:A,MATCH(ROWS($A$2:$A2),DataSheet!$H:$H,0)),"")

copied down and across to get all the info. Where DataSheet!$H:$H is the column you placed the numbering formula in.

[Wally]

NBVC,
Thank you so much the count part of the function is exactly what I was looking for.
I have never used IFERROR and INDEX, so some extra info for me as well.
May all the good karma stay with you and again THANK YOU.
Wally.

[NBVC]

You are welcome. Glad it works for you.

I am sure you noticed, but I had a small typo in the COUNT formula.... I referenced G1 when I should have referenced G2...

=IF(AND(B2=View!$B$1,G2=View!$C$1),COUNT(H$1:H1)+1,"")