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文章 2024-08-31 来自：开发者社区

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阿里云文档 2023-09-03

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。

文章 2023-08-29 来自：开发者社区

通过实战探索数据库中的char、varchar、varchar2、nvarchar2的部分区别

前言注：本文的实践是在oracle数据库中进行的，主要基于字节与字符以及定长与变长方面考虑，探索这四个类型的部分区别Oracle数据库中，char、varchar、varchar2、nvarchar2是我们常用到的数据类型（MySQL中没有varchar2和nvarchar2，也可以参考本文来比较MySQL中char和varchar的区别）下面我们做一个简单的实验吧：首先创建一个表，里面有aa，....

文章 2017-06-15 来自：开发者社区

[Android Pro] sqlite数据库的char,varchar,text,nchar,nvarchar,ntext的区别

reference : http://blog.csdn.net/xingfeng0501/article/details/7817121 1、CHAR。CHAR存储定长数据很方便，CHAR字段上的索引效率级高，比如定义char(10)，那么不论你存储的数据是否达到了10个字节，都要占去10个字节的空间,不足的自动用空格填充。 2、VARCHAR。存储变长数据，但存储效率没...

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