10.11 Get equal time intervals
Divide a time interval between two dates into N equal segments.
Divide sale records dated from 2014/01/20 to 2015/01/20 (not inclusive) into four groups according to date, and store them to different files. Below is part of the sale data:
| ORDERID | CUSTOMERID | EMPLOYEEID | ORDERDATE | AMOUNT |
|---|---|---|---|---|
| 10400 | EASTC | 1 | 2014/01/01 | 3063.0 |
| 10401 | HANAR | 1 | 2014/01/01 | 3868.6 |
| 10402 | ERNSH | 8 | 2014/01/02 | 2713.5 |
| 10403 | ERNSH | 4 | 2014/01/03 | 1005.9 |
| 10404 | MAGAA | 2 | 2014/01/03 | 1675.0 |
| … | … | … | … | … |
The range(s,e,k:n) function divide records between s and e into n equal segments and return the first record of segment k and that of segment segment k+1. The result is a 2-tuple sequence.
SPL script:
| A | B | |
|---|---|---|
| 1 | =file(“Sales.txt”).import@qt() | |
| 2 | [2014/01/20,2015/01/20] | |
| 3 | for 4 | =range(A2(1),A2(2), A3:4) |
| 4 | =A1.select(B3(1)<=OrderDate && OrderDate<B3(2)) | |
| 5 | =file(“Sales”+string(B3(1), “yyyyMMdd”)+“.txt”).export@t(B4) | |
A1 Import Sales table.
A2 Define the start date and the end date.
A3-B3 Perform a loop operation, where range() function divides the date interval into four parts and return the A3th part each time.
B4 Get records through matching dates to corresponding subintervals.
B5 Create a file and export selected records in B4 to it.
Execution result:
| Members |
|---|
| 2014/01/20 |
| 2014/04/22 |
| Members |
|---|
| 2014/04/22 |
| 2014/07/22 |
| Members |
|---|
| 2014/07/22 |
| 2014/10/21 |
| Members |
|---|
| 2014/10/21 |
| 2015/01/20 |
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