Groupby() and count()

Hi Community,

I want to perform count() operation on a column. And also remove duplicates in query aggregation. But i can't able to use both at same time. Im getting duplicates for subject id. 

{101,1},

{102,1},

{103,2}

here i want the count of deptId as 2 but im getting count as 3

aggregation: a!queryAggregation(
aggregationColumns: {
a!queryAggregationColumn(
field: "EmployeeID",
isGrouping: true
),
a!queryAggregationColumn(
field: "deptID",
aggregationFunction: "COUNT"

)

}
),

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