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MySQL 索引问题 Using temporary; Using filesort

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MySQL 索引问题 Using temporary; Using filesort

多表连查的时候，当第一个表有数据时，连查就很快。
如果没有 就很慢；
其他表也不想加索引。改如何解决呢？
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by (71.8m points)

给出SQL和执行计划，给出各表的索引情况，才能分析


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