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https://www.postgresql.org/docs/9.1/queries-with.html
7.8. WITH Queries (Common Table Expressions). WITH provides a way to write auxiliary statements for use in a larger query. These statements, which are often referred to as Common Table Expressions or CTEs, can be thought of as defining temporary tables that exist just for one query.Each auxiliary statement in a WITH clause can be a SELECT, INSERT, UPDATE, or DELETE; and the WITH clause …
https://www.postgresql.org/docs/8.4/queries-with.html
7.8. WITH Queries (Common Table Expressions). WITH provides a way to write subqueries for use in a larger SELECT query. The subqueries, which are often referred to as Common Table Expressions or CTEs, can be thought of as defining temporary tables that exist just for this query.One use of this feature is to break down complicated queries into simpler parts.
https://www.citusdata.com/blog/2018/05/15/fun-with-sql-recursive-ctes/
Common Table Expressions in PostgreSQL are a powerful SQL construct. You can think of CTEs as a view that is materialized only while the query is running. Recursive CTEs allow themselves to be called until some condition is met. This post from the Citus Data team explores how recursive CTEs work in …
http://blog.timothyandrew.net/blog/2013/06/24/recursive-postgres-queries/
Recursive Queries. I’ve used gems like awesome_nested_set before, but as far as I could find, none of them supported fetching results across multiple models. Then I stumbled on a page describing PostgreSQL’s support for recursive queries! That seemed perfect. Let’s solve this particular problem using recursive queries.
non-recursive WITH clause support. ... We'll have to do something much more clever to get recursive queries to work but for non-recursive queries that's sufficient. Example: postgres=# with a as (select 1 as x) select * from (select * from a) as x; x ---1 (1 row)-- Gregory Stark
https://www.postgresql.org/
PostgreSQL is a powerful, open source object-relational database system with over 30 years of active development that has earned it a strong reputation for reliability, feature robustness, and performance. There is a wealth of information to be found describing how to install and use PostgreSQL through the official documentation. The PostgreSQL ...
https://wiki.postgresql.org/wiki/What%27s_new_in_PostgreSQL_9.3
Sep 02, 2016 · Waiting for 9.3 – Support writable foreign tables; postgres_fdw . A new contrib module, postgres_fdw, provides the eponymous foreign data wrapper for read/write access to remote PostgreSQL servers (or to another database on the local server). A simple usage example (connecting to a different database on the same server for ease of testing). 1.
https://www.postgresql.org/about/featurematrix/
Feature Matrix . This table outlines which features were added in which version. To get more information about a feature, click the link or hover the mouse pointer over the text.
https://stackoverflow.com/questions/23494361/recursive-function-in-postgres
@rastapanda - Postgres has a configuration parameter max_stack_depth, that specifies the maximum depth of the server's execution stack. It's default value (2MB) severely limits recursive functions. A simple test recursive function with two integer arguments reaches the limit on about 1000th level.
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