# New to Qlik Sense

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New Contributor II

## Max number of days between dates

I've decided to take a different approach to the question I posted previously that I think will give me the result I want. After looking at it for awhile I realized my data has no 0 values so of course it would be impossible for me to find the max number of consecutive zero days. Instead I've wrote an algorithm in pseudo-code that I think should work but am having a hard time converting it to qlik syntax. This is all to help me find the max days in the current year without an incident.

1. Create variable dummyvariable1 and set equal to zero.

2. Create variable dummyvariable2 and set equal to zero.

3. Find first date with value. I made something that works for this:

daynumberofyear(FirstSortedValue( Date,aggr(max({<Type={P}, RCC={1}, Responsibility={MS,S,TW,U}, Formality={F}>}Date),Date),1))

4. Find 2nd date with value

5.Subtract 2nd dates daynumberofyear from 1st dates daynumberofyear and store in dummyvariable1.

6. Find next date with a value and subtract its daynumberofyear from previous day with a value. Store this in dummyvariable2.

7. If dummyvariable2>dummyvariable1 then dummyvariable1 gets the value of dummyvariable2.

8. Find next date with value and subtract its day from the previous dates day with a value. Store this in dummyvariable2.

9. If dummyvariable2>dummyvariable1 then dummyvariable1 gets the value of dummyvariable2.

10. Repeat

Some sample data:

Date                  Value

6/12/18                   1

6/13/18                   1

6/21/18                   2

6/22/18                   1

6/26/18                   1

7/04/18                   1

7/16/18                   3

7/17/18                   1

7/23/18                   1

7/24/18                   1

1 Solution

Accepted Solutions
MVP

## Re: Max number of days between dates

If you want to find it in the load script this logic could be used:

If you want to calculate it purely in the app and not in the load script/data model:

The first measure for the KPI is:

Max(Aggr(Only(Date)-Above(Only(Date)), Date ))

The second measure for the KPI is:

Aggr(If( Rank(TOTAL Only(Date)-Above(Only(Date))) = 1 , Date , Null() ),Date)

In the table the measure is simply:

If( Rank(TOTAL Only(Date)-Above(Only(Date))) = 1 , Max(Aggr( Only(Date)-Above(Only(Date)) , Date )) , Null() )

and in the properties of the table I had to turn off the checkmark for "Include zero values" like this:

6 Replies
MVP

## Re: Max number of days between dates

If you want to find it in the load script this logic could be used:

If you want to calculate it purely in the app and not in the load script/data model:

The first measure for the KPI is:

Max(Aggr(Only(Date)-Above(Only(Date)), Date ))

The second measure for the KPI is:

Aggr(If( Rank(TOTAL Only(Date)-Above(Only(Date))) = 1 , Date , Null() ),Date)

In the table the measure is simply:

If( Rank(TOTAL Only(Date)-Above(Only(Date))) = 1 , Max(Aggr( Only(Date)-Above(Only(Date)) , Date )) , Null() )

and in the properties of the table I had to turn off the checkmark for "Include zero values" like this:

New Contributor II

## Re: Max number of days between dates

Thank you this helped so much!

New Contributor II

## Re: Max number of days between dates

One more question actually. I was able to use the code you suggested and modify it with my parameters:

Max(Aggr(Only(Date)-Above(Only(Date)), Date ))

turned into

Max(Aggr(Only({<Formality={F}, Type={P}, Responsibility={MS,S,TW,U}, RCC={1}>}Date)-Above(Only({<Formality={F}, Type={P}, Responsibility={MS,S,TW,U}, RCC={1}>}Date)),Date))

However, how can I make this default to data only for the max year. When I deselect my 2018 filter it changes that data and looks for the the max days of no incidence over the past 4 years. I would like the number to stay as the 2018 number even when I deselect the filter. I tried a couple if statements but they just gave me null. Thanks!

MVP

## Re: Max number of days between dates

You have to add Year as a Set Modifier field along with the others. And the element value for the Year should be the maximum year irrespective of any selections:

Max(

Aggr(

Only({<Formality={F}, Type={P}, Responsibility={MS,S,TW,U}, RCC={1}, Year={\$(=Max({1} Year))}>} Date)

-

Above(

Only({<Formality={F}, Type={P}, Responsibility={MS,S,TW,U}, RCC={1}, Year={\$(=Max({1} Year))}>} Date)

)

,

Date

)

)

MVP

## Re: Max number of days between dates

You're welcome

New Contributor II

## Re: Max number of days between dates

Thanks! This worked.