ETL question
Best Answer
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Create a Unique Identifier:
Ensure that your dataset has a unique identifier for each row. If not, you can create one using a combination of columns with something such as
CONCAT(Column1, '-', Column2)
Set Up the Initial Dataflow:
Create a dataflow that will serve as the initial baseline for your dataset. This dataflow will include all the rows in your dataset at the start.
Create the Recursive Dataflow:
Create a recursive dataflow that compares the current dataset with the previous version (i.e., the output of the previous run of this dataflow) to identify new rows.
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Answers
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This example will show you how to do recursion.
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Create a Unique Identifier:
Ensure that your dataset has a unique identifier for each row. If not, you can create one using a combination of columns with something such as
CONCAT(Column1, '-', Column2)
Set Up the Initial Dataflow:
Create a dataflow that will serve as the initial baseline for your dataset. This dataflow will include all the rows in your dataset at the start.
Create the Recursive Dataflow:
Create a recursive dataflow that compares the current dataset with the previous version (i.e., the output of the previous run of this dataflow) to identify new rows.
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You might be able to create some kind of timestamp. But you would probably have to keep a history or something.
CASE
WHEN created_at > DATE_SUB(CURRENT_DATE(), INTERVAL 1 DAY) THEN 'New Row'
ELSE 'Existing Row'
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