**User-1075092149 posted**
i woud like to sum specific value ,how can i write a foumula to create a expression field.

for example

sum(field_1) where field_2 in ('A','B','C')

is it sum function with condition. i don't know how to write the formula.

sum(column, condition)

i would like to accumulate sum some field where field_2 in ('A','B','C')