From http://www.w3schools.com (Copyright Refsnes Data)
You can test your SQL skills with W3Schools' Quiz.
The test contains 20 questions and there is no time limit.
The test is not official, it's just a nice way to see how much you know, or don't know, about SQL.
You will get 1 point for each correct answer. At the end of the Quiz, your total score will be displayed. Maximum score is 20 points.
Good luck! Start the SQL Quiz
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From http://www.w3schools.com (Copyright Refsnes Data)