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Re:Ask HN: Best way to learn SQL? by tjr on Wednesday May 15, 2013 @02:38PM (#5713896)
Old but good: http://philip.greenspun.com/sql/

Supplement with a good resource specific to the RDBMS you are using.

Re:Ask HN: Best way to learn SQL? by j_s on Wednesday May 15, 2013 @03:25PM (#5714177)
Nice to know this is still worth digging into... I'd forgotten about it.