Set the length of columns with character data types 设置字符数据类型的列的长度。
Is a fixed attribute of simple character data type 是简单字符数据类型(
Maximum length , in bytes , for binary or character data types 二进制或字符数据类型的最大长度(字节数) 。
Maximum length in characters for binary or character data types 二进制或字符数据类型的最大长度(字符数) 。
The normalizedstring data type is derived from the string data type 规格化的字符串数据类型是从字符数据类型里派生出来的。
Character data types 字符数据类型
Both are simple character data types meaning , to simplify a bit , any string 这两者都是简单字符数据类型(简单地说,就是任意字符串) 。
However , this behavior does not apply to all character data types across all data sources 然而,这种行为并不适用于所有数据源上的所有字符数据类型。
For example , you cannot join a column that has a numeric data type with a column that has a character data type 例如,不能将具有数值数据类型的列和具有字符数据类型的列相联接。
Oracle has the concept of specifying a length and then specifying the actual storage size for some character data types 对于某些字符数据类型, oracle的观念是先指定长度,然后指定实际存储大小。