Thank you!
Something like
```
with t as (
select set_config('ns.blah', '1', false) as res
)
select res from t;
select current_setting('ns.blah');
```
works for me.
Andrew Gierth <and...@tao11.riddles.org.uk> 于2019年1月4日周五 下午6:27写道：
>
> >>>>> "Zexuan" == Zexuan Luo <spacewander...@gmail.com> writes:
>
> Zexuan> For instance:
> Zexuan> ```
> Zexuan> with t as (
> Zexuan> select set_config('blah', '1', false)
> Zexuan> )
> Zexuan> select current_setting('blah');
>
> A CTE containing a SELECT query which is not referenced anywhere will
> not be executed, even if it contains volatile functions. (CTEs
> containing INSERT/UPDATE/DELETE that are not referenced _will_ still be
> executed.)
>
> --
> Andrew (irc:RhodiumToad)
