Aasmund,
> I do not know whether it is part of the SQL standard.
>
> Variables...
Nope.
> CREATE VARIABLE foobar INTEGER DEFAULT 1 NOT NULL;
>
> SELECT * FROM thebar WHERE id = foobar;
>
> CREATE TEMPORARY VARIABLE...
> CREATE CONSTANT....
Extensive support for a variety of variable types and constructions is
available in FUNCTIONS. PL/pgSQL, PL/TCL, PL/Perl ... take your pick.
For the raw command-line SQL, variables, constants, and other procedural
language elements are not appropriate. This is best done in procedures,
functions, and middleware.
Of course, it is an Open-Source project, so if you hire your own
programmer, you can do anything you want.
-Josh Berkus
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