比如

字段A： 'ab,cd,ef,gh'

字段B： 'aa,bb,cc,dd' 没有相同值

字段A： 'ab,cd,ef,gh'

字段B： 'aa,bb,cd,dd' 有相同值cd

1.CREATE OR REPLACE TYPE ty_str_split IS TABLE OF VARCHAR2 (4000);

2.CREATE OR REPLACE FUNCTION cux_pub_str_split (p_str IN VARCHAR2, p_delimiter IN VARCHAR2)

RETURN ty_str_split PIPELINED

IS

j INT := 0;

i INT := 1;

len INT := 0;

len1 INT := 0;

str VARCHAR2 (4000);

BEGIN

len := LENGTH (p_str);

len1 := LENGTH (p_delimiter);

WHILE j < len

LOOP

j := INSTR (p_str, p_delimiter, i);

IF j = 0

THEN

j := len;

str := SUBSTR (p_str, i);

PIPE ROW (str);

IF i >= len

THEN

EXIT;

END IF;

ELSE

str := SUBSTR (p_str, i, j - i);

i := j + len1;

PIPE ROW (str);

END IF;

END LOOP;

RETURN;

END cux_pub_str_split;

3.测试数据，可以转化成表，然后用表的形式进行判断

或用oracle 取交集函数intersect

select regexp_substr(nme, '[^,]+', 1, rownum) nme

from (select '北京,杭州,上海' nme from dual)

connect by rownum <= length(regexp_replace(nme, '[^,]+')) +1

intersect

select regexp_substr(nme, '[^,]+', 1, rownum) nme

from (select '北京,上海,四川,郑州' nme from dual)

connect by rownum <= length(regexp_replace(nme, '[^,]+')) +1;