topic Re: Concatenate and distinct in QlikView

Concatenate and distinct

MindaugasBacius — Thu, 02 Feb 2017 13:31:03 GMT

Hei,

I've faced an interesting issue.

While making Concetanate I am also using Distinct of the table I do concatenate.

Unfortunately, after that all the values have become Distinct in whole table.

There is an example.

Without Distinct:

TMP:

LOAD * INLINE [

];

Concatenate(TMP)

LOAD * INLINE [

];

With Distinct:

TMP:

LOAD * INLINE [

];

Concatenate(TMP)

LOAD Distinct * INLINE [

];

I would like to understand the fundamentals of this issue. Why is that so?

Thank you!

Re: Concatenate and distinct

Anonymous — Thu, 02 Feb 2017 13:45:59 GMT

Have a look at this blog http://www.qlikfix.com/2013/07/30/distinct-can-be-deceiving/

Re: Concatenate and distinct

Anil_Babu_Samineni — Thu, 02 Feb 2017 13:46:26 GMT

First of all, You need to understand what / how will work for DISTINCT

So, Here For first case it could be definitely correct

For Second one, I can split into few ways

TMP:

LOAD * INLINE [

];

From Above It will give

Concatenate(TMP)

LOAD Distinct * INLINE [

];

So, For second inline memory it takes as DISTINCT for all F1 Values it will consider as all values which concatenate the first valies

So, Finally It takes like below for all values as DISTINCT function

So, From this you can count(F1) then figure it out.

I am not the good explain person but this is the case finally it consider DISTINCT for whole Field due to Concatenate of all Fields which is Associated.

HTH

Re: Concatenate and distinct

sunny_talwar — Thu, 02 Feb 2017 13:46:36 GMT

Not entirely sure it happens. But my guess is that since its the same table TMP it assumes to distinct across the whole table. The work around would be....

TMP:

LOAD * INLINE [

];

Table:

NoConcatenate

LOAD Distinct * INLINE [

];

Concatenate(TMP)

LOAD *

Resident Table;

DROP Table Table;

Re: Concatenate and distinct

omkarvamsi — Thu, 02 Feb 2017 14:00:42 GMT

to my idea,

first the qlikview load two tables ,after two tables are appended to one table the Distinct on F1 implemented,

thats why we can see only distinct values when using DISTINCT.