The following documentation comment has been logged on the website: Page: https://www.postgresql.org/docs/15/sql-select.html Description:
hi i have a discussion in pgsql-b...@lists.postgresql.org about this and it is mentioned in the answers that it is documented and a "feature" of Postgres that this can be done. If this is wanted the documentation (https://www.postgresql.org/docs/current/sql-select.html) that mentioned: " Description SELECT retrieves rows from zero or more tables. The general processing of SELECT is as follows: 1.) All queries in the WITH list are computed. These effectively serve as temporary tables that can be referenced in the FROM list. A WITH query that is referenced more than once in FROM is computed only once, unless specified otherwise with NOT MATERIALIZED. (See WITH Clause below.) 2.) All elements in the FROM list are computed. (Each element in the FROM list is a real or virtual table.) If more than one element is specified in the FROM list, they are cross-joined together. (See FROM Clause below.) 3.) If the WHERE clause is specified, all rows that do not satisfy the condition are eliminated from the output. (See WHERE Clause below.) 4.) If the GROUP BY clause is specified, or if there are aggregate function calls, the output is combined into groups of rows that match on one or more values, and the results of aggregate functions are computed. If the HAVING clause is present, it eliminates groups that do not satisfy the given condition. (See GROUP BY Clause and HAVING Clause below.) 5.) The actual output rows are computed using the SELECT output expressions for each selected row or row group. (See SELECT List below.) " isn't correct because how can 4.) be done and the alias from 5.) is used? Here is a hint important that there is an exception for alias used in group by the SQL for that: with tbase(id) as (select 1 union all select 2) select id otto from tbase group by otto order by otto what do you think about that? hape
