You can test your SQL skills with W3Schools' 测试.
The test contains 25 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.
每答对一题， 您将获得 1 分。在测试结束时，将显示您的总分。 Maximum score is 25 points.
If you don't know SQL, we suggest that you read our SQL Tutorial from scratch.
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