目录一、基础语法：多列 IN 的两种写法1. 直接值列表2. 子查询二、对比传统 OR 的写法三、性能分析与优化1. 索引利用2. 数据量影响3. 分批次查询四、兼容性与注意事项1. 数据库支持2. 常见错误五、动态生成条件（通用
I have a very large database with about 120 Million records in one table.I have clean up the data in this table first before I divide it into several tables(possibly normalizing it). The columns of th
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