Query designer 3.5 - SUMGT formula = 1

Hello,

I want to calculate the number of ligne in my query. To do this I create a column with formula = 1 and an other column with formula = SUMGT of first column. But the result is always 1. Why and how get the number of line?

               Column1 = 1       Column = SUMGT column1            Expected result

Line 1               1                              1                                              3

Line 2               1                              1                                              3

Line 3               1                              1                                              3

Thanks.