Sample code to get row count based on two key fields

Hi All,

I have a requirement to get row count in DSO2 based on two kef fields as shown below, data is getting loaded from DSO1 to DSO2.

Keyfield1 keyfield2 count (new field)

aaaa abc 1

aaaa cde 2

bbbb fgh 1

bbbb ijk 2

Please share me sample code based on this requirement. Thanks

Regards,

Manju