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cqlsh -k mykeyspace -e 'COPY fromTable(columnNames) TO STDOUT' | head -n -1 | cqlsh -k mykeyspace -e 'COPY toTable(columnNames) FROM STDIN'


MongoDB's dynamic schema supports different fields for documents within the same collection, so there is no strict requirement for all documents to have an active field. The main consideration here will be how that affects your application logic; it may be simpler to have an explicit field present and check the value. If you have an index on a field, ...

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