SQL documentation wiki [closed]

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Inspired by how much of an improvement the MDC Javascript/开发者_开发知识库DOM docs are over W3Schools, I was looking for a similar wiki comparable to the W3Schools SQL documentation today. I haven't had much luck.

Is there a wiki documenting all the SQL commands with common-use examples, caveats, and vendor-dependent implementations?

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The best documentation usually comes from the source itself. Which documentation you want depends on your RDBMS:

• MS SQL Server Transact-SQL Reference or Index
• PostgreSQL SQL Syntax
• SQLite SQL Syntax with pretty railroad diagrams
• MySQL SQL Syntax
• Oracle SQL Reference

Edit: Based on your updated question, the answer is "What you want does not exist."

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Based on your SQL Server tag, you might want to check out MSDN. Vendors usually maintain decent doc themselves (see MySQL and Oracle 10g)