Apesar dos meus incansáveis esforços, ainda não temos um “Dia do DBA”. Mas ao menos já temos quadrinhos! Não percam os quadrinhos sobre as aventuras de um DBA Oracle Jr. A dica veio do Sr. Robert Treat no Planet PostgreSQL.
Infelizmente o link está quebrado e não achei nenhuma nova referência aos quadrinhos no google.
Hello,
(Sorry for the spam)
You might be interested in using the “snowflake query” diagrams generated with the “Reverse Snowflake Joins” open source tool. You can find a presentation at http://revj.sourceforge.net
The tool parses SQL Select statements and generates a diagram. It shows parts of the underlying SQL directly in the diagram. For example x=30 , GROUP BY (year), SUM(sales), HAVING MIN(age) > 18.
The primary reason for the tool was to avoid cartesian joins and loops in SQL written by hand, with many joined tables. The database will execute such a syntactically correct statement , even though it is not what the user intended to get.
-Alex
http://sourceforge.net/projects/revj
http://sourceforge.net/projects/cubulus/
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