Question

I have a table like this:

How do I count rows that have identical values in columns A,B,C,D ?

The column ‘ID’ will be ignored.

For this case, the count result is 2.

Answer 1

How about:

 SELECT COUNT(*), A, B, C, D
 FROM dbo.YourTable
 GROUP BY A, B, C, D
 -- optional - if you want to skip all the rows that occur only once
 -- HAVING COUNT(*) > 1 

Basically, you just group your data by the columns of interest, and let SQL count the rows that match each set of column values.