In contrast, PostgreSQL's VARCHAR is inherently based on UTF-8 Unicode, making it more flexible in terms of character set support. Here are the main differences in VARCHAR between SQL Server and ...

character set support, and usage details of VARCHAR among various databases, with SQL Server and PostgreSQL being particularly representative, which directly affects query syntax. This article will ...

长度可以是从0到255的任何值。 当存储CHAR值时，它们会被右填充到指定的长度。 当检索CHAR值时，除非启用了PAD_CHAR_TO_FULL_LENGTH SQL模式（默认没启用），否则会删除尾随空格。 VARCHAR列中的值是可变长度字符串。 长度可以指定为0到65,535的值。

SQL is a conventional database language that is used to maintain, create and recover relational database whereas PL/SQL, Procedural Language extension to SQL, it prolongs SQL and provides procedural ...