目录一、基础语法：掌握条件更新的三要素WHERE子句的五大运算符二、进阶实战：企业级更新策略场景1：跨表条件更新（多表联动）场景2：基于子查询的精确更新场景3：批量更新时的锁优化三、性能优化：百万级数据更新方
I have this piece of SQL that is being fed to Mysql. CREATE TABLE pn_history( member INT, action INT,
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