Defining string to represent null values in select
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
Brent Wood <pcreso@yahoo.com> schrieb:
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.
COALESCE:
test=*# select coalesce(NULL, 'NaN');
coalesce
----------
NaN
Andreas
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