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[FAQ Bot] NEW: PyFlink session window job fails with 'please declare primary key for si #249

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[FAQ Bot] NEW: PyFlink session window job fails with 'please declare primary key for si #249

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8 changes: 8 additions & 0 deletions .../data-engineering-zoomcamp/general/058_e08b9c753f_pyflink-sess-window-pk-fix.md
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id: e08b9c753f
question: PyFlink session window job fails with 'please declare primary key for sink
table when query contains update/delete record' error
sort_order: 58
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Session window aggregations produce updates while the session is still open. The JDBC sink needs a primary key so it knows which row should be updated in the table. Without a primary key, Flink cannot apply the updates and the job fails. Define a primary key in the sink table using the window boundaries and the grouping key (for example window_start, window_end, and PULocationID).