Many thanks for your help. and also would you tell me how can i add days per a week in a drill-down group? I mean, for example now with your help, i have a bar chart for last month per every week of month, now i want to click on a specific week of last month, then it show me the count of tickets per every days of this week. I know i can do it by drill-down group in dimension but the condition in expression avoid it.
