mysql的explain

回答: 在MySQL中，EXPLAIN是一个关键字，用于显示MySQL如何使用索引来处理SELECT语句以及连接表。它可以帮助你选择更好的索引并编写更优化的查询语句。通过在SELECT语句之前添加EXPLAIN关键字，MySQL会返回执行计划的信息，而不是执行该SQL语句。使用EXPLAIN可以模拟优化器执行SQL语句，分析查询语句或结构的性能瓶颈。除了普通的EXPLAIN，还有两个变种：EXPLAIN EXTENDED和EXPLAIN PARTITIONS。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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