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Solving a Sudoku using Recursive Subquery Factoring

OracleのSQL再起処理で数独を解く

AMIS Technology blog » Blog Archive » Oracle RDBMS 11gR2 - Solving a Sudoku using Recursive Subquery Factoring

sun main page

this is the sun oracle merger from the sun page.

On April 20, 2009, Sun and Oracle announced a definitive agreement under which Oracle will acquire Sun common stock for $9.50 per share in cash. The transaction is valued at approximately $7.4 billion, or $5.6 billion net of Sun's cash and debt. The proposed transaction is subject to Sun stockholder approval, certain regulatory approvals and customary closing conditions. Until the deal closes, each company will continue to operate independently, and it is business as usual.

RT @monkchips: Oracle bought Sun. i think IBM kind of fucked up. http://tinyurl.com/cgavxo <-More like Oracle bought mySQL and Sun came with [from http://twitter.com/danphilpott/statuses/1565134176]

データベースパフォーマンスアップの教科書 基本原理編

どこの現場に行っても正解を導く方程式は一緒なので応用が利く Oracle、SQLServer、MySQLと色々なDBのチューニングをしてきましたが、 どれもRDBの理論に基いているので基本原理を知ればチューニングは可能なはず インデックススキャンの種類や、実行計画の読み方もわかりやすく詳しい

I've worked with expensive SQL Server and Oracle setups for most of my career. I've defended them viciously against all comers and contrarians. I've participated in late-night guerilla flame wars and drunken bar brawls. And I've sought out with relentless tunnel vision those pieces of propaganda which support my foregone conclusion: that SQL Server and/or Oracle are (or were) the best choices for the organization. I used to be a commercial database advocate. These databases have put food on my table for a dozen years, you see. I am (or was) what you might call an entrenched practicioner, not necessarily an expert, but a practicioner. And in the manner of entrenched practicioners around the world, I've treated you heretics with the sadistic undercutting and poisonous rancor you've deserved! "MySQL?" I would sneer. "PostgreSQL? Thanks, but this a serious project. We need a database we can depend on." Ahem.

googled "why pay for commercial database" and found this among other articles

Are Commercial Databases Worth It? http://bit.ly/Du96H (via @newsycombinator) [from http://twitter.com/tadej/statuses/1664387681]

Se cuestiona la idoneidad de escoger una BD comercial com Oracle o SQL Server frente a sus alternativas Open Source.