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explain 时显示 key 为null 是为何?
    innodb 存储引擎, 使用 explain 时, 显示: type possible_keys key key_len ref ALL NULL NULL NULL NULL 就算是走主键索引, 也应该显示: key PRIMARY 才对呀.这是为何呢....
asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)
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