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A comment on Show HN: SQL Police Department – Learn SQL while solving crimes. Parent comment

Re:Show HN: SQL Police Department – Learn SQL while solving ... by antman on Monday May 04, 2020 @01:10PM (#23070604)
Great collection thanks! Has anyone used them or have any comment on the difficulty of the sources above?
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Re:Show HN: SQL Police Department – Learn SQL while solving ... by jmhwang7 on Monday May 04, 2020 @01:23PM (#23070772)
I've used sqlbolt.com! It's great. Very easy to follow and it's interactive. They have a resource for regex: https://regexone.com/, which I've gone through as well!
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