Question : Counting the number of time an item occurs with another event

Hello,

I have the following table and I want to create a query that will display the number of times each InvestNum appears with each other InvestNum for the same EventNum. For example, I want to display that A is in the same eventnumber as B three times and so forth for each Invest number. I think that I might need a cross tab query but am not sure.
I would appreciate any help. Thanks.

EventNum      InvestNum
1        A
1        F
1        B
1        C
1        G
2        A
2        c
2        D
2        B
2        F
3        A
3        E
3        C
3        B
3        D

Answer : Counting the number of time an item occurs with another event

I am not sure if I understood your requirements. Look at the query below.
Is this what you need? For your example of data it returns following counts:

A      B      3
A      C      3
A      D      2
A      E      1
A      F      2
A      G      1
B      C      3
B      D      2
B      E      1
B      F      2
B      G      1
C      D      2
C      E      1
C      F      2
C      G      1
D      E      1
D      F      1
F      G      1

1:
2:
3:
4:



SELECT t1.InvestNum, t2.InvestNum, count(*)
FROM Table2 t1 INNER JOIN Table2 t2 ON ( t1.EventNum = t2.EventNum)
WHERE t1.InvestNum < t2.InvestNum 
group by t1.InvestNum, t2.InvestNum;

Open in New Window

Select All