"Nico Sabbi" <nsabbi@officinedigitali.it> writes:
> nb1=# select r.a from (select row(tab1.*)::tab1 as r from tab1)x;
> ERROR: missing FROM-clause entry for table "r"
> LINE 1: select r.a from (select row(tab1.*)::tab1 as r from tab1)x;
> ^
> I tried many variations (including casting x as tab1) obtaining only syntax
> errors.
r.a would be the column "a" in the table named "r", but the only table in the
FROM list is "x". So you have to use a workaround to make it clear to the
parser that you're referring to the column "r", it would look like
SELECT (r).a from (select row(tab1.*)::tab1 as r from tab1)x;
--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com