so 25. 5. 2024 v 10:24 odesÃlatel <walt...@technowledgy.de> napsal: > Pavel Stehule: > > Sure there is more possibilities, but I don't want to lost the > > possibility to write code like > > > > CREATE TEMP VARIABLE _x; > > > > LET _x = 'hello'; > > > > DO $$ > > BEGIN > > RAISE NOTICE '%', _x; > > END; > > $$; > > > > So I am searching for a way to do it safely, but still intuitive and > > user friendly. > > Maybe a middle-way between this and Alvaro's proposal could be: > > Whenever you have a FROM clause, a variable must be added to it to be > accessible. When you don't have a FROM clause, you can access it directly. > > This would make the following work: > > RAISE NOTICE '%', _x; > > SELECT _x; > > SELECT tbl.*, _x FROM tbl, _x; > > SELECT tbl.*, (SELECT _x) FROM tbl, _x; > > SELECT tbl.*, (SELECT _x FROM _x) FROM tbl; > > > But the following would be an error: > > SELECT tbl.*, _x FROM tbl; > > SELECT tbl.*, (SELECT _x) FROM tbl; > > It looks odd - It is not intuitive, it introduces new inconsistency inside Postgres, or with solutions in other databases. No other database has a similar rule, so users coming from Oracle, Db2, or MSSQL, Firebird will be confused. Users that use PL/pgSQL will be confused.
Regards Pavel > > Best, > > Wolfgang >
