compare day to day before in a straight table

[#1]

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

[MK_QSL]

Provide some sample data....

[#3]

so can see some sample data in the table

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

[SergeyMak]

Hi

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

[#5]

here is a sample data

many thanks!

[SergeyMak]

Hi

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

[SergeyMak]

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
];

[its_anandrjs]

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

[#9]

it workes great!!

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

[SergeyMak]

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