Difference between Row Value and Previous Row Value

[#1]

Hi all,

i need to replicate this situation:

DATE	Day
06/08/11	15
21/08/11	4
25/08/11	9
03/09/11	14
17/09/11	8
25/09/11	6
01/10/11	9
10/10/11	5
15/10/11	23
07/11/11	16
23/11/11	25
18/12/11	10
28/12/11	44
10/02/12	99

For Example  15 = 21/08/11- 06/08/11

How can i do?

Thanks a lot

[sunny_talwar]

Try this:

Table:

LOAD Date#(DATE, 'DD/MM/YY') as DATE;

LOAD * Inline [

DATE

06/08/11

21/08/11

25/08/11

03/09/11

17/09/11

25/09/11

01/10/11

10/10/11

15/10/11

07/11/11

23/11/11

18/12/11

28/12/11

10/02/12

];

NewTable:

LOAD Peek('DATE')- DATE as Day,

  DATE

Resident Table

Order By DATE desc;

DROP Table Table;

[Digvijay_Singh]

This also works -

Input:

Load Date#(Date,'DD/MM/YY') as Date inline [

Date

06/08/11

21/08/11

25/08/11

03/09/11

17/09/11

];

Output:

Load Date,

  if(Date1-Date>0,Date1-Date,0) as Days;

Load Date,

  Peek('Date',recno(),'Input') as Date1

Resident Input;