Using one of my original test tables I'm testing windowing functions with a GROUP BY.
The following query works as I would expect. -- Works SELECT department, SUM(Salary), ROW_NUMBER() OVER (ORDER BY department), SUM(SUM(salary)) OVER (ORDER BY department) FROM employees GROUP BY department; The following one fails with the message. ERROR: variable not found in subplan target list -- Does not work. SELECT department, SUM(Salary), ROW_NUMBER() OVER (ORDER BY department), SUM(SUM(salary)) OVER (ORDER BY department DESC) FROM employees GROUP BY department; I just added the DESC to force it into creating 2 separate windows. I can re-write the non working query to work using the following: SELECT department, salary, ROW_NUMBER() OVER (ORDER BY department), SUM(salary) OVER (ORDER BY department DESC) FROM (SELECT department, SUM(salary) AS salary FROM employees GROUP BY department ) t; Testing with: create table employees ( id INT primary key, name varchar(30) not null, department varchar(30) not null, salary int not null, check (salary >= 0) ); insert into employees values(1,'Jeff','IT',10000); insert into employees values(2,'Sam','IT',12000); insert into employees values(3,'Richard','Manager',30000); insert into employees values(4,'Ian','Manager',20000); insert into employees values(5,'John','IT',60000); insert into employees values(6,'Matthew','Director',60000); -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers