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I'm Trying in the cassandra query language tool DevCenter 1.6.0 to get the date difference from existing table.

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There is no such built-in function in CQL - you can potentially implement user-defined function for it, but this will require additional programming in Java, and that will also require changing the cassandra.yaml configuration file to enable support for user-defined functions (see linked documentation for details).

Alex Ott
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