Provide a test for variable existence in psql
Thanks for the editing & commit.
Pavel's feedback helped to devise a nicer syntax, although it was not
strictly speaking a review.
--
Fabien.
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To make changes to your
Provide a test for variable existence in psql
"\if :{?variable_name}" will be translated to "\if TRUE" if the variable
exists and "\if FALSE" otherwise. Thus it will be possible to execute code
conditionally on the existence of the variable, regardless of its value.
Fabien Coelho, with some revie
