**基本用法** ```sql SELECT LENGTH('Hello, World!') AS length_of_string FROM dual; ``` 这将返回 `13`,因为字符串 `'Hello, World!'` 包含 13 个字符。 2. **指定字符集** 假设你有一个包含多字节字符的字符串(例如中文),并且你想计算这些字符的数量。如果字符集支持多字节字符,你可以通过...
--Count the length of stringselectlengthb('select * from scott.emp')ascountted_by_byte, length('select * from scott.emp')ascountted_by_charfromdual;--For some character encoding, the length() and the lengthb() is same in english--you may use this feature to check whether the string ...
SELECT LENGTH('Hello World') AS LengthOfString FROM dual;输出：LengthOfString 11 示例2：计算字段的长度 SELECT LENGTH(first_name) AS LengthOfFirstName FROM employees;输出：LengthOfFirstName 5 6 3 ...示例3：计算CLOB字段的长度 SELECT LENGTH(clob_column) AS LengthOfClob FROM my_table;输出：Len...
DECLARE v_string VARCHAR2(50) := 'Hello World'; v_length NUMBER; BEGIN EXECUTE IMMEDIATE 'SELECT LENGTH(:1) FROM DUAL' INTO v_length USING v_string; DBMS_OUTPUT.PUT_LINE('Length of the string: ' || v_length); END; 复制代码 在上面的例子中,我们先定义了一个字符串变量v_string,然后...
如可以用length(‘string’)=lengthb(‘string’)判断字符串是否含有中文。 转自网络: http://topic.csdn.net/t/20040630/16/3135181.html http://space.itpub.net/?uid-231499-action-viewspace-itemid-63770 select length('我') from dual --返回1 ...
这个页面有XCode实现，核心查询部分共100多行代码，包括一个查询、一个总记录数分页、两个统计（就是业...
SELECT'Oracle LENGTH'string,LENGTH('Oracle LENGTH')LenFROMdual;Code language:SQL (Structured Query Language)(sql) Try it Output: See the followingemployeestable in thesample database: The following statement sorts the employees by the lengths of their first names. It uses theLENGTH()function in...
select substr(inlst, instr(inlst, ',', 1, rownum) +1, instr(inlst, ',', 1, rownum +1) - instr(inlst, ',', 1, rownum) -1) from (select ',' || '1,25,3,ftet775##,8,6,9,' || ',' inlst from dual) connect by rownum <= length(inlst) - length(replace(inlst, ...
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) ...
select * from t where length(c1) != lengthb(c1); 二. 判断记录中是否有乱码 这里需要使用asciistr 函数,ASCIISTR 的官网说明: http://download.oracle.com/docs/cd/E11882_01/server.112/e26088/functions014.htm#i1000190 ASCIISTR takesas its argument a string, or an expression th...