mysql 多表联查慢
时间: 2023-10-12 15:04:19 浏览: 44
在这种情况下,如果两个表的关联查询非常慢,可能是由于以下几个原因导致的。
首先,可以考虑是否为关联查询的列建立了索引。根据MySQL的优化规则,只有在WHERE和JOIN中出现的列建立索引才会有效果。因此,可以尝试为关联查询的列建立索引,以提高查询速度。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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