RIGHT JOIN (or RIGHT OUTER JOIN): It’s the opposite of a LEFT JOIN. It keeps all rows from the right table and matches from ...

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Katharine Beer is a writer, editor, and archivist based in New York. She has a broad range of experience in research and writing, having covered subjects as diverse as the history of New York City's ...

在MySQL数据库中，索引是提升查询性能的关键工具。合理设计索引能显著降低查询延迟，但错误的索引策略可能导致存储空间浪费和写入性能下降。根据业务场景 ...

电话号码必须用 string 存，你敢用 int 就等着犯错吧 其实按照我的编程习惯，只要该类型不参与计算，即使看着是数字，我也会毫不犹豫的选择 string。 我们曾经尝试用 int 存过，但是都不是很理想，后来直接改用了 string。 接下来我们就聊聊电话号码看起来像数字，为什么不能 int。 一、int 存电话，有三大缺陷 缺陷 1、前导零丢失 ...