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Re: psql \set variables in crosstab queries?

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Ron <ronljohnsonjr@xxxxxxxxx> writes:
> According to 
> https://www.postgresql.org/docs/12/app-psql.html#APP-PSQL-VARIABLES and 
> experience, variables don't interpolate inside of string literals:
> "
> Variable interpolation will not be performed within quoted SQL literals and 
> identifiers. Therefore, a construction such as ':foo' doesn't work to 
> produce a quoted literal from a variable's value.
> "

> But crosstab takes text strings as parameters.  How then do you use \set 
> variables in crosstab queries?

If you read a little further, you'll find out the syntax for converting
the value of a psql variable to a SQL string literal:

regression=# \set foo BAR
regression=# select ':foo';
 ?column? 
----------
 :foo
(1 row)

regression=# select :'foo';
 ?column? 
----------
 BAR
(1 row)

What the server got in the last case was "select 'BAR';".

			regards, tom lane





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