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union - How do I select some rows and then others in MySQL?
    I have this query, it works but I'm not sure if it's the best approach and I don't get what I want. I need ... exam_group='jpx' AND subject='chemistry' ) ab GROUP BY id LIMIT 40...
asked Feb 6, 2021 in Technique[技术] by 深蓝 (71.8m points)
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