topic Re: Max Value Within an Array in QlikView

Max Value Within an Array

Thu, 05 Jan 2017 18:23:52 GMT

Hello,

I have a table with a set of unique IDs, shared IDs, and Dates. When loading the data, I'm attempting to add a calculated column which lists the maximum date associated with the shared IDs for each unique ID. I've been able to determine these values in excel using an array formula, but I'm at a loss as to how I should proceed with loading and modifying this data using QlikView. There may be any number of unique IDs associated with the same Shared ID.

For example, something that inputs the 3 leftmost columns and will be able to output the maximum date.

Unique ID	Shared ID	Date	*Maximum Date*
1	A	1/1/2017	1/1/2017
2	A	12/12/2016	1/1/2017
3	B	2/2/2017	2/2/2017
4	B	11/11/2016	2/2/2017

Thank you in advance for your help!

Re: Max Value Within an Array

lironbaram — Thu, 05 Jan 2017 18:46:54 GMT

assuming your source table has three fields try this

Table

load [Unique ID],[shared ID],[Date]

FROM your Table

left join (Table )

load [shared ID],

max([Date]) AS Maximum_Date

resident Table

Re: Max Value Within an Array

sunny_talwar — Thu, 05 Jan 2017 19:03:22 GMT

Another way to do this:

Table:

LOAD * INLINE [

Unique ID, Shared ID, Date

1, A, 1/1/2017

2, A, 12/12/2016

3, B, 2/2/2017

4, B, 11/11/2016

];

FinalTable:

LOAD *,

If([Shared ID] = Previous([Shared ID]), Peek('MaxDate'), Date) as MaxDate

Resident Table

Order By [Shared ID], Date desc;

DROP Table Table;

Re: Max Value Within an Array

Thu, 05 Jan 2017 20:44:09 GMT

I've tried this solution a number of ways but it says 'Invalid expression' highlighting from left join onward. The other answer did work however. Thank you

Re: Max Value Within an Array

Thu, 05 Jan 2017 20:44:23 GMT

Thank you this worked perfectly!

Re: Max Value Within an Array

sunny_talwar — Thu, 05 Jan 2017 20:56:22 GMT

Some minor corrections

Table:

LOAD [Unique ID],

[shared ID],

[Date]

FROM yourTable;

Left Join (Table)

LOAD [shared ID],

Max([Date]) as Maximum_Date

Resident Table

Group By [shared ID];