Question

ORACLE 怎么拆分字符串

Answer 1

拆分sql后：

select 

substr('Hello World',0,instr('Hello World','o')) as 首,

substr('Hello World',instr('Hello World','o')+1) as 尾

from dual;

有什么规定吗？

“ABCDEFGH”或是“A，B，C，D，E，F，G，H"

按符号拆分？按位置拆分？

substr()函数：截取a-b之间的或a 。如：substr('Hello World',0,5)截取1-5或

substr('Hello World',0,instr('Hello World','o'))截取1-"o"的位置

1.如果是"，"等符号：

select substr('Hello World',0,instr('Hello World','o'))  from dual;

select substr('Hello World',instr('Hello World','o')+1)  from dual;

或

select substr('Hello World',instr('Hello World','o')+1,length('Hello World'))  from dual;

Answer 2

代码如下：
CREATE OR REPLACE TYPE str_split IS TABLE OF VARCHAR2 (4000);
CREATE OR REPLACE FUNCTION splitstr(p_string IN VARCHAR2, p_delimiter IN VARCHAR2)
RETURN str_split
PIPELINED
AS
v_length NUMBER := LENGTH(p_string);
v_start NUMBER := 1;
v_index NUMBER;
BEGIN
WHILE(v_start <= v_length)
LOOP
v_index := INSTR(p_string, p_delimiter, v_start);

IF v_index = 0
THEN
PIPE ROW(SUBSTR(p_string, v_start));
v_start := v_length + 1;
ELSE
PIPE ROW(SUBSTR(p_string, v_start, v_index - v_start));
v_start := v_index + 1;
END IF;
END LOOP;

RETURN;
END splitstr;

创建完毕后，我们来测试一下，例如执行如下SQL：
select * from table(splitstr('Hello,Cnblogs!',','));

Answer 3

http://www.cnblogs.com/nicholas_f/articles/1526063.html