Table of Contents

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  1. Preface
  2. Transformations
  3. Source transformation
  4. Target transformation
  5. Access Policy transformation
  6. Aggregator transformation
  7. B2B transformation
  8. Chunking transformation
  9. Cleanse transformation
  10. Data Masking transformation
  11. Data Services transformation
  12. Deduplicate transformation
  13. Expression transformation
  14. Filter transformation
  15. Hierarchy Builder transformation
  16. Hierarchy Parser transformation
  17. Hierarchy Processor transformation
  18. Input transformation
  19. Java transformation
  20. Java transformation API reference
  21. Joiner transformation
  22. Labeler transformation
  23. Lookup transformation
  24. Machine Learning transformation
  25. Mapplet transformation
  26. Normalizer transformation
  27. Output transformation
  28. Parse transformation
  29. Python transformation
  30. Rank transformation
  31. Router transformation
  32. Rule Specification transformation
  33. Sequence transformation
  34. Sorter transformation
  35. SQL transformation
  36. Structure Parser transformation
  37. Transaction Control transformation
  38. Union transformation
  39. Vector Embedding transformation
  40. Velocity transformation
  41. Verifier transformation
  42. Web Services transformation

Transformations

Transformations

Example: Use a window to calculate expiration dates

Example: Use a window to calculate expiration dates

You are a banker with information about the financial plans of two of your customers. Each plan has an associated start date.
For each customer, you want to know the expiration date for the current plan based on the activation date of the next plan. The previous plan ends when a new plan starts, so the end date for the previous plan is the start date of the next plan minus one day.
The following table lists the customer codes, the associated plan codes, and the start date of each plan:
CustomerCode
PlanCode
StartDate
C1
00001
2014-10-01
C2
00002
2014-10-01
C2
00002
2014-11-01
C1
00004
2014-10-25
C1
00001
2014-09-01
C1
00003
2014-10-10
To calculate expiration dates, complete the following tasks:
  1. Define partition and order keys.
    You configure the following window properties to partition the data by customer code and order the data by ascending start date:
    Property
    Value
    Description
    Frame
    Not specified.
    The LEAD function will access rows based on the offset argument and ignore the frame.
    Partition key
    CustomerCode
    Groups the rows according to customer code so that calculations are based on individual customers.
    Order key
    StartDate Ascending
    Arranges the data chronologically by ascending start date.
    The following table lists the data grouped by customer code and ordered by start date:
    CustomerCode
    PlanCode
    StartDate
    C1
    00001
    2014-09-01
    C1
    00002
    2014-10-01
    C1
    00003
    2014-10-10
    C1
    00004
    2014-10-25
    C2
    00001
    2014-10-01
    C2
    00002
    2014-11-01
  2. Define a window function.
    You define a LEAD function to access the subsequent row for every input.
    You configure an expression field that performs the following calculation:
    LEAD ( StartDate, 1, '01-Jan-2100' )
    For more information about the LEAD function, see
    Function Reference
    .
  3. Define an ADD_TO_DATE function.
    You use an ADD_TO_DATE function to subtract one day from the date you accessed.
    You configure an expression field that performs the following calculation:
    ADD_TO_DATE ( LEAD ( StartDate, 1, '01-Jan-2100' ), 'DD', -1, )
    By subtracting one day from the start date of the next plan, you find the end date of the current plan.
    The following table lists the end dates of each plan:
    CustomerCode
    PlanCode
    StartDate
    EndDate
    C1
    00001
    2014-09-01
    2014-09-30
    C1
    00002
    2014-10-01
    2014-10-09
    C1
    00003
    2014-10-10
    2014-10-24
    C1
    00004
    2014-10-25
    2099-12-31*
    C2
    00001
    2014-10-01
    2014-10-31
    C2
    00002
    2014-11-01
    2099-12-31*
    *The LEAD function returned the default value because these plans have not yet ended. The rows were outside the partition, so the ADD_TO_DATE function subtracted one day from 01-Jan-2100, returning 2099-12-31.

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