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Defining string to represent null values in select

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Hi,

I can specify the text used to represent a null value in output from copy, but I'd like to do something similar is select output, eg: all NULL values are represented by NA or NaN.

I can't find anything in the docs about this.

This could be managed using case statements around all the columns in the query, but is there a simpler way, like setting a system variable to specify this?

Thanks,

  Brent Wood

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