WITH myconstants (var1, var2) as (
values (5, 'foo')
)
SELECT *
FROM somewhere, myconstants
WHERE something = var1
OR something_else = var2;-- with myVar as (select "any value really")
-- then, to get access to the value stored in this construction, you do
-- (select * from myVar)
-- for example
with var as (select 123)
... where id = (select * from var)
-- You could event re-cast the value (e.g. from INT to VARCHAR)
with var as (select 123)
... where id = ((select * from var)::VARCHAR)