I have this source data :
First I want to group by "Name" (I already did this part), after this I want to create the"category" column, if a "Name" group have any row type1 = A, then the Category is "X" else category = "Z"
This is the result I want:
How can I get the category group-column in reporting services?
My defacto method for this would be to edit the SQL query feeding the report and add the logic to add the group there. I assume that's not possible or you don't have access to the SQL layer, so here a way to do it completely in SSRS:
Name
groupFor the field expression, do a lookupset on the name field value and check if A exists in the results
=IIF(Array.IndexOf(Lookupset(Fields!Name.Value, Fields!Name.Value, Fields!Type1.Value, "DatasetName"), A) > -1, "X", "Z")
If you build the expression piece-meal, use the following expression to first check that your lookupset is working:
=JOIN(LookupSet(...), ",")
Then add the IIF(Array.IndexOf(...,A) > -1, X, Z)
to see if the returned array contains your "A" value.