Comments on: Variable number of joins http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/ with occasional pedestrian SQL topics Sun, 01 Nov 2009 17:24:11 +0000 http://wordpress.com/ hourly 1 By: Iggy Fernandez http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/#comment-1090 Iggy Fernandez Wed, 09 Sep 2009 20:02:56 +0000 http://vadimtropashko.wordpress.com/?p=117#comment-1090 Hi, Vadim, It's official: Oracle Database 11gR2 offers the recursive WITH clause. Iggy http://download.oracle.com/docs/cd/E11882_01/server.112/e10881/chapter1.htm#AREANO02555 1.3.1.2 Recursive WITH Clause The SQL WITH clause has been extended to enable formulation of recursive queries. Recursive WITH clause complies with the American National Standards Institute (ANSI) standard. This makes Oracle ANSI-compatible for recursive queries. Hi, Vadim,

It’s official: Oracle Database 11gR2 offers the recursive WITH clause.

Iggy

http://download.oracle.com/docs/cd/E11882_01/server.112/e10881/chapter1.htm#AREANO02555

1.3.1.2 Recursive WITH Clause
The SQL WITH clause has been extended to enable formulation of recursive queries.

Recursive WITH clause complies with the American National Standards Institute (ANSI) standard. This makes Oracle ANSI-compatible for recursive queries.

]]> By: The Tenth Solution « So Many Oracle Manuals, So Little Time http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/#comment-1085 The Tenth Solution « So Many Oracle Manuals, So Little Time Mon, 10 Aug 2009 03:38:10 +0000 http://vadimtropashko.wordpress.com/?p=117#comment-1085 [...] Congratulations to Laurent Schneider (Switzerland), Craig Martin (USA), Rob van Wijk (Netherlands), Vadim Tropashko (USA), Alberto Dell’Era (Italy), Fabien Contaminard (France), Cd-MaN (Romania), and André Araujo [...] [...] Congratulations to Laurent Schneider (Switzerland), Craig Martin (USA), Rob van Wijk (Netherlands), Vadim Tropashko (USA), Alberto Dell’Era (Italy), Fabien Contaminard (France), Cd-MaN (Romania), and André Araujo [...]

]]> By: Results of the First International NoCOUG SQL Challenge « So Many Oracle Manuals, So Little Time http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/#comment-1081 Results of the First International NoCOUG SQL Challenge « So Many Oracle Manuals, So Little Time Fri, 31 Jul 2009 19:45:18 +0000 http://vadimtropashko.wordpress.com/?p=117#comment-1081 [...] fourth solution—by Vadim Tropashko from the USA—used recursive common table expressions to generate records. [...] [...] fourth solution—by Vadim Tropashko from the USA—used recursive common table expressions to generate records. [...]

]]> By: First International NoCoug SQL Challenge – And the Winner is… « I’m just a simple DBA on a complex production system http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/#comment-1080 First International NoCoug SQL Challenge – And the Winner is… « I’m just a simple DBA on a complex production system Fri, 31 Jul 2009 04:46:34 +0000 http://vadimtropashko.wordpress.com/?p=117#comment-1080 [...] Vadim Tropashko’s solution using 11gR2 recursive joins This entry should win the shortest solution award. (USA). [...] [...] Vadim Tropashko’s solution using 11gR2 recursive joins This entry should win the shortest solution award. (USA). [...]

]]> By: Who Should Tune SQL: The DBA or The Developer? « So Many Oracle Manuals, So Little Time http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/#comment-1067 Who Should Tune SQL: The DBA or The Developer? « So Many Oracle Manuals, So Little Time Sun, 12 Jul 2009 18:40:12 +0000 http://vadimtropashko.wordpress.com/?p=117#comment-1067 [...] fourth solution—by Vadim Tropashko from the USA—used recursive common table [...] [...] fourth solution—by Vadim Tropashko from the USA—used recursive common table [...]

]]> By: The First International NoCOUG SQL Challenge: Nine Ways To Change a Lightbulb « So Many Oracle Manuals, So Little Time http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/#comment-1059 The First International NoCOUG SQL Challenge: Nine Ways To Change a Lightbulb « So Many Oracle Manuals, So Little Time Wed, 08 Jul 2009 05:16:48 +0000 http://vadimtropashko.wordpress.com/?p=117#comment-1059 [...] fourth solution was found by Vadim Tropashko from the USA who observed that recursive common table [...] [...] fourth solution was found by Vadim Tropashko from the USA who observed that recursive common table [...]

]]> By: Got Lost Following NoCoug SQL Challenge? « I’m just a simple DBA on a complex production system http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/#comment-1018 Got Lost Following NoCoug SQL Challenge? « I’m just a simple DBA on a complex production system Mon, 20 Apr 2009 21:54:57 +0000 http://vadimtropashko.wordpress.com/?p=117#comment-1018 [...] Vadim Tropashko’s solution using Common Table Expressions (USA): http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/ [...] [...] Vadim Tropashko’s solution using Common Table Expressions (USA): http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/ [...]

]]> By: First International NoCoug SQL Challenge « I’m just a simple DBA on a complex production system http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/#comment-1008 First International NoCoug SQL Challenge « I’m just a simple DBA on a complex production system Tue, 31 Mar 2009 23:52:02 +0000 http://vadimtropashko.wordpress.com/?p=117#comment-1008 [...] Go ahead. Try to solve it. Not as easy as it looks? When Iggy first sent me the problem description, I thought it was impossible. I sent it to few friends, just to annoy them. And turned out that it is far from impossible. In the process, the challenge description was leaked, and we have few terrific solutions already: Rob Van-Wijk used Model, Laurent used connect-by and Vadim used 11gR2! [...] [...] Go ahead. Try to solve it. Not as easy as it looks? When Iggy first sent me the problem description, I thought it was impossible. I sent it to few friends, just to annoy them. And turned out that it is far from impossible. In the process, the challenge description was leaked, and we have few terrific solutions already: Rob Van-Wijk used Model, Laurent used connect-by and Vadim used 11gR2! [...]

]]> By: Vadim Tropashko http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/#comment-1004 Vadim Tropashko Fri, 27 Mar 2009 16:18:29 +0000 http://vadimtropashko.wordpress.com/?p=117#comment-1004 Thank you, Laurent: I discovered the challenge via your site. Regarding rule 110 simulation query in my previous comment, it is not quite a solution because oracle doesn't allow in the recursive definition clause 1. subqueries and 2. more than two union branches Workaround the second issue is simple, but absence of subqueries invalidates this approach. On the other hand, a grid is a spreadsheet, so model clause query should be a straightforward solution. This is remarkable, because excel is often cited as Turing incomplete programming system. I guess the critical item is ability to create new cells dynamically. Thank you, Laurent: I discovered the challenge via your site.

Regarding rule 110 simulation query in my previous comment, it is not quite a solution because oracle doesn’t allow in the recursive definition clause
1. subqueries and
2. more than two union branches
Workaround the second issue is simple, but absence of subqueries invalidates this approach.

On the other hand, a grid is a spreadsheet, so model clause query should be a straightforward solution. This is remarkable, because excel is often cited as Turing incomplete programming system. I guess the critical item is ability to create new cells dynamically.

]]> By: Laurent Schneider http://vadimtropashko.wordpress.com/2009/03/25/variable-number-of-joins/#comment-1002 Laurent Schneider Thu, 26 Mar 2009 19:30:36 +0000 http://vadimtropashko.wordpress.com/?p=117#comment-1002 I am amazed by your solution. I did read about it in your book, but had no clue it was working in 11.2. I would definitely vote for yours :) I am amazed by your solution. I did read about it in your book, but had no clue it was working in 11.2.

I would definitely vote for yours :)

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