topic Re: Re: compare day to day before in a straight table in QlikView

compare day to day before in a straight table

Sun, 09 Nov 2014 17:11:20 GMT

Hey all!

i am trying to create an expression that will show me the sum of a field but in the previus day

Date	Date -1	sum cost of Date	sum cost of Date -1
2.11	1.11	20	10
3.11	2.11	30	20
4.11	3.11	40	30
5.11	4.11	50	40

i want to develop the [sum cost of Date -1] expression in this table but without using the Above() \ Below() Functions

please help!!

Mor

Re: compare day to day before in a straight table

MK_QSL — Sun, 09 Nov 2014 17:37:20 GMT

Provide some sample data....

Re: compare day to day before in a straight table

Mon, 10 Nov 2014 07:02:30 GMT

so can see some sample data in the table

my table has 2 fields: date (dimension) and cost (measure)

Re: compare day to day before in a straight table

SergeyMak — Mon, 10 Nov 2014 07:08:12 GMT

Move calculations to the load script and you will achieve the result.

If you'd like a solution, please share a sample of your data.

Regards,

Sergey

Re: Re: compare day to day before in a straight table

Mon, 10 Nov 2014 07:18:12 GMT

here is a sample data

many thanks!

Re: compare day to day before in a straight table

SergeyMak — Mon, 10 Nov 2014 07:34:27 GMT

Solution here

Time_Filters:

LOAD *,
Peek('Date') AS [Date-1],
Peek('Cost') AS [Cost-1];
LOAD * INLINE [Date,Cost
01/11/2014,10,
02/11/2014,20,
03/11/2014,30,
04/11/2014,40,
05/11/2014,50,
06/11/2014,60,
07/11/2014,70
];

Regards,

Sergey

Re: compare day to day before in a straight table

SergeyMak — Mon, 10 Nov 2014 07:37:21 GMT

To be more precise

Time_Filters:

LOAD *,
IF(isNull(Peek('Date')), Date(Num(Date)-1), Peek('Date')) AS [Date-1],
IF(isNull( Peek('Cost')),0,Peek('Cost')) AS [Cost-1];
LOAD * INLINE [Date,Cost
01/11/2014,10,
02/11/2014,20,
03/11/2014,30,
04/11/2014,40,
05/11/2014,50,
06/11/2014,60,
07/11/2014,70
];

Re: compare day to day before in a straight table

its_anandrjs — Mon, 10 Nov 2014 08:05:40 GMT

Hi,

Try this way i am updated the Lubranski code for previous Date

SET DateFormat='DD/MM/YYYY';

TableName:

LOAD *,if(IsNull(Peek('Date')),Date( Date - 1 ), Peek('Date')) AS PrevDate,

if(IsNull(Peek('Cost')),0, Peek('Cost')) AS PrevCost;

LOAD Date#(Date,'DD/MM/YYYY') AS Date,Cost;

LOAD * INLINE [

Date,Cost

01/11/2014,10,

02/11/2014,20,

03/11/2014,30,

04/11/2014,40,

05/11/2014,50,

06/11/2014,60,

07/11/2014,70

];

And you get the table data as

Regards

Anand

Re: Re: compare day to day before in a straight table

Mon, 10 Nov 2014 12:13:31 GMT

it workes great!!

but can you please explain me how is it working???

Re: compare day to day before in a straight table

SergeyMak — Mon, 10 Nov 2014 15:20:52 GMT

Hi,

Peek() function get the value from the previous row.

IsNull test is needed because Peek() returns Null() for the first row, but it's better to put 0.

You can find more information here Peek() vs Previous() – When to Use Each

Regards,

Sergey