The Oracle LENGTH function is used to return the length of a given string. If the string has data type CHAR, then the length includes all trailing blanks. If a string is null, then this function returns null.The
Source_string指定源字符表达式;pattern指定规则表达式;replace_string指定用于替换的字符串;position指定起始搜索位置;occurtence指定替换出现的第n个字符串;match_parameter指定默认匹配操作的文本串。 其中replace_string,position,occurtence,match_parameter参数都是可选的。 15、REGEXP_SUBSTR(source_string, pattern[,pos...
1、length 语法:length(p_string) 解释:返回字符串的字符长度,如果p_string为NULL或为空,则返回NULL。 示例: SELECT length('ab 中国') col1, length(' ') Col2, length('') Col3, length(NULL) Col4 FROM dual; 2、lengthb 语法:lengthb(p_string) 解释:返回字符串的字节长度,如果 p_string 为NULL...
l length(char):返回字符串的长度。 l substr(char,m,n):取字符串的子串,m表示起点,n 代表取 n 个字符的意思 l replace(char1,search_string,replace_string) 替换 l instr(char1,char2,[,n[,m]]) 取子串在字符串的位置(特别取某一个特殊字符在原字符串中的位置) l trim(' Hello World '), 结...
You can also use this function to return the length of a string.first argument–list or stringExample 1 The following expression returns 2.<length> <list> apples oranges </list> </length>Example 2 <length> Hello world! </length>This expression returns a value ...
The syntax for the LENGTH function in Oracle/PLSQL is: LENGTH( string1 ) Parameters or Arguments string1 The string to return the length for. Note:Ifstring1is NULL, then the LENGTH function will return NULL. Applies To The LENGTH function can be used in the following versions of Oracle/...
After processing all department names, the maximum bit length stored in "v_max_length" is returned as the result of the function. Flowchart: Improve this sample solution and post your code through Disqus Previous:PL/SQL String Functions Exercises Home. ...
在Oracle数据库中,LENGTH和INSTR函数可能会返回错误的值的情况有以下几种可能原因: 1. 字符集不匹配:LENGTH和INSTR函数在处理字符串时,会根据数据库的字符集来确定字符的长度...
FUNCTION LENGTH (string1VARCHAR2) RETURN NUMBER Ifstring1is NULL, then LENGTH returns NULL—not zero! Remember that a NULL string is a “nonvalue.” Therefore, it cannot have a length, even a zero length. The LENGTH function, in fact, will never return zero; it will always return either...
The SUBSTR function returns a substring of a string. 对于其他的我不做过多的说明,我在这里只是想说明他们在对于第二、三个参数上的差异做一些解析。 position,代表的是我们要截取的字符串char的起始位置。substring_length是指我们要截取的长度,这里两个数据库的处理方式就有分歧了。