Line chart for past three months based on date selected in filter

[Saurabh07]

Hello Gurus,

I have some requirement in my Qlik app. I have below dataset to work with;

Month	Country	Value
01-01-2020	USA	50
01-01-2020	India	137
01-01-2020	China	118
01-01-2020	Austria	51
01-01-2020	Japan	144
01-02-2020	USA	147
01-02-2020	India	61
01-02-2020	China	70
01-02-2020	Austria	93
01-02-2020	Japan	79
01-03-2020	USA	80
01-03-2020	India	99
01-03-2020	China	102
01-03-2020	Austria	122
01-03-2020	Japan	61
01-04-2020	USA	87
01-04-2020	India	51
01-04-2020	China	67
01-04-2020	Austria	76
01-04-2020	Japan	88
01-05-2020	USA	112
01-05-2020	India	102
01-05-2020	China	108
01-05-2020	Austria	94
01-05-2020	Japan	113

Now I want to see a 3 month trend for Top 2 countries in line chart. To get top 2 countries I am using mentioned expression;

=aggr(if(rank(sum(Value))<3,Country),Country)

But I am not able to figure out on how to get the trend for only past three months from the date selected in filter. eg. If I select '01-05-2020' in filter the graph should show only the months of '01-05-2020','01-04-2020' and '01-03-2020'. Similarly if I select '01-04-2020' in the filter, the graph should show only the months of '01-04-2020', '01-03-2020' and '01-02-2020'

Can anyone please help me with this? Some assistance here would be highly appreciated! 

[lironbaram]

hi 
try this expression : 

sum({<Month={">=$(=addmonths(max(Month),-2))"}>}Value)

[Saurabh07]

Hello  @lironbaram , Thank you for the expression. But there is a small issue with this, it works absolutely fine when Max date (01-05-2020) is selected.

But if I select '01-04-2020', the graph shows trend for four months instead of three. Ideally '01-05-2020' should be eliminated from the trend since it comes after '01-04-2020'. The ideal result I want to see here is past 3 months trend only from the selected month.

[MayilVahanan]

HI @Saurabh07 

Try with below

sum({<Month={">=$(=addmonths(max(Month),-2))<=$(=addmonths(max(Month),0))"}>}Value)

[Saurabh07]

@MayilVahanan  Many thanks. This has almost worked except for one more condition. Can you also help me figure out on how do I accommodate the state in my expression for Date filter. eg. If I create an alternate state [Current] and apply it to the filter, then this expression wont work. It would be a great help if you can help me resolve this issue?

[MayilVahanan]

HI @Saurabh07 

Try like below. 

sum({Current<Month={">=$(=addmonths(max({Current}Month),-2))<=$(=addmonths(max({Current}Month),0))"}>}Value)

Please go through before link about Alternate state.

Link: https://help.qlik.com/en-US/qlikview/April2020/Subsystems/Client/Content/QV_QlikView/Examples%20of%2...