Re: WITH Support

From: "Edwin S(dot) Ramirez" <ramirez(at)idconcepts(dot)org>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: WITH Support
Date: 2006-12-29 15:43:17
Message-ID: 45953795.9090006@idconcepts.org
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The WITH that I am thinking about, lets you define and reuse queries which are executed once. For example:

WITH
MySummary AS (*SELECT b.dept_name, Sum(Salary) AS total_sal FROM emp a join dept b on (a.dept_id = b.dept_id)
GROUP BY b.dept_name*)
SELECT dept_name, total_sal //FROM MySummary
WHERE total_sal > (
SELECT SUM (total_sal) * 1/12
FROM MySummary)
ORDER BY total_sal

You can introduce multiple "aliases" and use them within any subsequent queries.

WITH
alias1 as (...)
alias2 as (...)
alias3 as (...)
SELECT ....

Thanks,

> Edwin Ramirez wrote:
> > Hello,
> >
> > What is the status of supporting the "WITH" keyword?
>
> I see these TODO items:
>
> * Add SQL99 WITH clause to SELECT
> * Add SQL:2003 WITH RECURSIVE (hierarchical) queries to SELECT
>
> Are they the same item?

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