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This appears to be the cause of the problems, from the same page quoted by ypercube: Trying to update the same row twice in a single statement is not supported. Only one of the modifications takes place, but it is not easy (and sometimes not possible) to reliably predict which one. This also applies to deleting a row that was already updated in the same ...


This should work but I'm not really sure if it's the best regarding efficiency: WITH copy_to_other_table AS ( INSERT INTO other_table (column_a, column_b) SELECT column_a, column_b FROM main_table WHERE column_a = 1 ), main_table_deleted AS ( DELETE FROM main_table WHERE column_a = 1 AND NOT EXISTS ...

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