DAX Summarize - drops records on group by - powerbi

Question

Source Data:
DAX:
Total Derived =
VAR selected_min_date =
MIN ( 'Date'[Date] )
VAR selected_max_date =
MAX ( 'Date'[Date] )
VAR vTable =
SUMMARIZE (
FILTER (
MyTable,
MyTable[PDate] >= selected_min_date
&& MyTable[PDate] <= selected_max_date
),
MyTable[Gcode],
MyTable[DerTax]
)
var result = sumx(vTable, MyTable[DerTax])
RETURN
Result
I was expecting result as 2644.48, but is outputting 1322.24
What am doing wrong.
I was same result same as with below sql.
Select GCode,
sum(DerTax)
from MyTable
where PDate >= #datemin and PDate <=#datemax
group by GCode

Answer 1

I don't think you've grasped how SUMMARIZE works. Since your Gcode and DerTax entries are identical for each of the two rows, your SUMMARIZE statement will generate a table comprising just a single row, viz:
Gcode
DerTax
Grp01
1322.24
Instead of passing DerTax as a GroupBy column, you should be passing an aggregation of that field:
Total Derived: =
VAR selected_min_date =
MIN( 'Date'[Date] )
VAR selected_max_date =
MAX( 'Date'[Date] )
VAR vTable =
SUMMARIZE(
FILTER(
MyTable,
MyTable[PDate] >= selected_min_date
&& MyTable[PDate] <= selected_max_date
),
MyTable[Gcode],
"Tax", SUM( MyTable[DerTax] )
)
VAR result =
SUMX(
vTable,
[Tax]
)
RETURN
Result