解释:string:源字符串 subString:要查找的子字符串 position:查找的开始位置 ocurrence:源字符串中第几次出现的子字符串 For example: INSTR('CORPORATE FLOOR','OR', 3, 2)中,源字符串为'CORPORATE FLOOR', 目标字符串为'OR',起始位置为3,取第2个匹配项的位置;返回结果为 14 '1...
selectINITCAP('substr,abc,substring')fromdual;--返回i在MISSISSIPPI中第3次出现的位置,selectINSTR('Mississippi','i',5,3)fromdual;selectINSTR('Mississippi','i',-2,3)fromdual;--返回的是字节selectINSTRB('Mississippi','i',5,3)fromdual;selectINSTRB('Mississippi','i',-2,3)fromdual;--长度sele...
The DBMS_OUTPUT.PUT_LINE function displays a message containing the number of characters requested and the extracted substring. Flowchart: Exercise 3: Write a PL/SQL function to retrieve the leftmost 5 characters of the department name for a specific department identified by its department ID. Tabl...
In oracle/PLSQL, the substr functions allows you to extract a substring from a string. The syntax for the substr function is: substr( string, start_position, [ length ] ) 说明: string is the source string. start_position is the position for extraction. The first position in the stri...
Instr(string, substring, position, 1. occurrence) 1. 其中 1. string:代表源字符串; 1. substring:代表想聪源字符串中查找的子串; 1. position:代表查找的开始位置,该参数可选的,默认为 1; 1. occurrence:代表想从源字符中查找出第几次出现的substring,该参数也是可选的,默认为1; ...
Oracle/PLSQL: Substr Function In Oracle/PLSQL, the substr functions allows you to extract a substring from a string. The syntax for the substr function is: substr( string, start_position, [ length ] ) string is the source string.
oracle客户端PL/SQL 微软的SQL客户端 方法/步骤 1 对于oracle中使用需要注意：1. select * from table1,table2 ==> Select Table1.* From Table1,Table2; 多表情况下，不能用没有表前缀的*2.一些基本函数的使用,比如getdate（）和sysdate，SubString和SubStr，Len和Length等3. 字段长度，后面有空格的，一律...
注:在Oracle/PLSQL中,instr函数返回要截取的字符串在源字符串中的位置。只检索一次,也就是说从字符的开始到字符的结尾就结束。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 selectinstr('hellohello','l',2,2)from dual;--返回结果:4也就是说:在"hellohello"的第2(e)号位置开始,查找第二次出现...
buffer := dbms_lob.substr(source_lob, 9, start_location); dbms_output.put_line('The substring extracted is: ' || buffer); end; / The first occurrence starts at position:8 The first occurrence starts at position:24 The substring extracted is: Oracle 9i PL/SQL 过程已成功完成。
In oracle/PLSQL, the substr functions allows you to extract a substring from a string. The syntax for the substr function is: substr( string, start_position, [ length ] ) 说明: string is the source string. start_position is the position for extraction. The first position in the string ...