Delete rows that have been dropped in a CDC flow

Question

Post Author: sgsampey
CA Forum: Data Integration
A newbie question:
I have a source table called Events with (significant) fields that look like:
EventIDEventNameBeginDateEndDateDaysOfWeekModifyDate
These data ranges can be quite long, and there's an exception table if the Event isn't being held on a given day
ExceptionIDEventIDExceptionDate
I need to flatten this data into a target Event_Instance table of individual days:
EventInstIDMasterEventIDEventNameDateDayOfWeek
I'm going to populate the target by combining Event source (filtered by modify date to only grab updates and additions) with a SQL table that creates a range of days, join that with the exception table, and filter based on no match in the exception table. That part's easy.
The problem I'm having is what do do when an Exception is removed or updated (Events are never removed - just canceled). There's no ModifyDate to look at. I know I need to create a buffer table to track changes, but once I identify execptions (in a Query Transform) that have been added since the last ETL, I don't see how to remove those Event_Instances. The two only solutions I can come up with is to wipe the entire Event_Instance table and rebuild with every ETL, or to add an 'action' field to Event_Instance, updateit to 'D' for those rows that need to be removed and then execute a SQL command to delete those rows once done.. I know there must be a better, incremental way to do this. TIA!

Answer 1

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