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php连接数据库之PDO，PDO的简单使用和预定义占位符的使用以及PDOStatement对象的使用，占位符的不同形式，bindValue和bindParam绑定预定义占位符参数的区别

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触发器和规则系统规则vs触发器有哪些区别？_云原生数据库PolarDB PostgreSQL版（兼容Oracle）_云原生数据库 PolarDB(PolarDB)

许多触发器可以干的事情同样也可以用PostgreSQL规则系统来实现。目前不能用规则来实现的东西之一是某些约束，特别是外键。可以放置一个合格的规则在一列上，这个规则在列的值没有出现在另一个表中时把命令重写成NOTHING。但是这样做数据就会被不声不响地丢弃，因此也不是一个好主意。如果要求检查值的有效性，并且在出现无效值的情况下应该生成一个错误消息，这种需求就必须要用触发器来完成。

问答 2022-03-31 来自：开发者社区

云原生数据库的对象体系结构中分片与分区的区别是什么？

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更新时间 2024-09-28 12:37:01

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