Doubt regarding load

[jyothish8807]

Hello Friends,

I am bit confuse and my doubt may sound silly, but need your help to understand this.

I have data coming on daily basis and my requirement is to show the latest data for each month. I have selection on month level, so when ever i select a month the latest data should be available on the app and the previous data should be ignored.

So what i am doing is:

Date	Name	Amount
22/1/2016	A	1000
22/1/2016	B	322
22/1/2016	C	234
23/1/2016	A	999
23/1/2016	B	322
23/1/2016	C	212
13/2/2016	A	123
13/2/2016	B	4332
13/2/2016	C	343
14/2/2016	A	222
14/2/2016	B	676
14/2/2016	C	432

In script, i am loading the entire data into a QVD, which will have all the data.

Then in application i am doing:

tablename:

load *

from table.qvd

inner join

load

max(Date)

resident Tablename

group by monthname(Date);

This is how i am capturing the latest data for each month.But while doing this, will all the data will be stored in to application or only the latest data will be stored ? I can see a sudden increase in size of application after implementing this logic.

Any suggestion will be really helpful. jagan‌

Regards

Jyothish KC

[jyothish8807]

Hi Jagan,

Thanks for your input, i have used an alias in my app. Missed to update here sorry.

In the above script you mentioned it will fetch only the latest data, but i want to group it on month basis. So for each month the latest data should be available. It is working fine from my approach also, but do my approach is storing the complete data ? Because my app size is increasing

Regards

KC

[amit_saini]

KC,

I think ur script is fine for the latest data , could be possibility size is more because of current latest one.

Why don't you cross check while loading ur qvd and check latest month or date.

This check will gv u clear picture.

Thanks,

AS

[Kushal_Chawda]

Hi KC,

Have you tried what I have suggested?

[jagan]

Hi,

If you do Inner join then the records would be reduced, I think it is not storing complete data.  Debug and check the rows count after each load script, this way you can make sure that only required rows are loaded.

Regards,

Jagan.

[jyothish8807]

Hi Rajesh,

How is the whole data being captured using my logic ? I am trying to understand this.

Regards

KC

[jyothish8807]

Hi Balraj,

In this case the group by will not work, since there are other fields also in the table and if you use max(Date) i load statement then also it will create issues.

Thanks for your help

Regards

KC

[jyothish8807]

Hi Khus,

Thanks for your help. In my case i don't want to do any changes at expression level and want to limit the data at script level itself. And i want to understand, do my approach is storing the whole data into the app ?

Regards

KC

[Kushal_Chawda]

tablename:

load *

from table.qvd

inner join

load

max(Date) as Date

resident Tablename

group by monthname(Date);

Instead of doing the Monthname(Date) in group by it is better to create the MonthYear field while you are loading the table.

I think your approach is not loading all the data as you are doing inner join but i think it will also not giving the correct results. You can modify the script like below to limit the data

Tablename:

load *,

monthname(Date) as MonthYear

from table.qvd

inner join

load MonthYear,

max(Date) as Date

resident Tablename

group by MonthYear;

[jyothish8807]

Hi Tamil,

As per your approach it will only load the latest month data.

I want to load the latest date for each month.

Regards

KC

[jyothish8807]

Hi jagan,

Thanks for you input, Do you have any other approach to do the same ? i am bit stuck to identify the reason of sudden increase of size. As per my knowledge also while doing an inner join only the data corresponding to the max date should be loaded into app.

Regards

KC