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

[Anonymous]

I think here you are getting previous data as well.

Storing the whole data in a QVD is fine, I would suggest when you load the data from QVD, then only load the latest data, may be like this?

load *,

max(Date)

From YourQVD

where 

Date=Date(max(Date),'YourDateFormat),   //Syntax can be corrected

group by monthname(Date);

//this will load only latest data

Hope this will help!!!

[Kushal_Chawda]

you can do something like below

Data:

LOAD *,

Year(DATE) as Year,

Month(DATE) as Month,

MonthName(DATE) as MonthYear;

LOAD *,date(Date#(Date,'DD/MM/YYYY')) as DATE Inline [

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 ];

Left Join

LOAD MonthYear,

    date(max(DATE)) as DATE,

    1 as MaxDateFlag

Resident Data

Group by MonthYear;

Now in front end You can select any Year & month

Expression

=sum({<MaxDateFlag={'1'}>}Amount)

[HirisH_V7]

Hi,

Like this,

Data:
LOAD * ,
Month(Date) as Month,
Num(Month(Date)) as MonthNum,
Year(Date) as Year
INLINE [
  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
     14/2/2017, C, 432
    ];

In Front end:

Chart Expression-

Sum( {$<[MonthNum] = {"$(=Max([MonthNum]))"},Year={"$(=Max(Year))"}>} Amount )

Hope this Helps,

PFA,

Hirish

[jagan]

Hi,

YOu missed Alias in the Max(Date), may be this is the reason the records are duplicating.

tablename:

load *

from table.qvd

inner join

load

max(Date) AS Date

resident Tablename

group by monthname(Date);

Instead you can also try like this

tablename:

load Date(Max(Date)) AS MaxDate

from table.qvd

LET vMaxDate = Date(Peek('MaxDate', 0));

tablename:

load *

from table.qvd

WHERE Date = '$(vMaxDate )';

This method also loads data faster.

Hope this helps you.

Regards,

Jagan.

[Kushal_Chawda]

if you just want to load the latest Data only in application then do this like below. If you want to load all the data but in front you just want to display latest data in chart then do like in my above post

Data:

LOAD *,

Year(DATE) as Year,

Month(DATE) as Month,

MonthName(DATE) as MonthYear;

LOAD *,date(Date#(Date,'DD/MM/YYYY')) as DATE Inline [

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 ];

Left Join

LOAD MonthYear,

    date(max(DATE)) as DATE,

     1 as MaxDateFlag

Resident Data

Group by MonthYear;

Final:

NoConcatenate

LOAD *

Resident Data

where MaxDateFlag='1';

DROP Table Data;

[tamilarasu]

You can also try,

Tablename:
LOAD
Month(Max(Date#(Date,'DD/MM/YYYY'))) as MaxDate
FROM
Test.qvd
(qvd);

LET vMaxDate = Peek('MaxDate');
Drop Table Tablename;

Table:
LOAD *
FROM
Test.qvd
(qvd) where Month(Date#(Date,'DD/MM/YYYY')) = '$(vMaxDate)' ;

[Anonymous]

Kush141087 agreed with you, this can be done.

By doing in your suggested way, we are loading previous data as well and at UI level we are restricting for our easily calculation.

Correct me , If I am wrong

But, in your case will it not load the previous data included latest data as well??

[rajeshforqlikvi]

Hi by doing this way you are capturing hole data in the resultant physical table including max date.

[amit_saini]

KC,

Try this:

Table:

LOAD

     Max(Date) as Date

FROM ...

GROUP BY MONTHNAME(Date);

Thanks,
AS