1.情景展示
在oracle当中，如何拆分以逗号隔开的字符串？（将字符串按指定字符拆分成多行数据）
比如：411600,411602,411603,411606,411609,411621,411622,411623,411624,411625,411626,411627,411628,411643,411681。
2.具体分析
oracle当中没有专门的字符串拆分函数；
但是，我们可以通过REGEXP_SUBSTR()和CONNECT BY LEVEL来实现。
如果，需要自定义创建split函数的话，见文末推荐。
3.解决方案
语法：
SELECT REGEXP_SUBSTR(string,
'[^特定字符]+',
1,
LEVEL,
'i') as 分割后结果
FROM DUAL
CONNECT BY LEVEL <= 特定字符在字符串当中出现的次数 + 1;
进一步优化
SELECT REGEXP_SUBSTR(string,
'[^特定字符]+',
1,
LEVEL,
'i') as 起个别名
FROM DUAL
CONNECT BY LEVEL <= LENGTHB(TRANSLATE(string, '特定字符' || string, '特定字符')) + 1;
查看代码
SELECT REGEXP_SUBSTR('411600,411602,411603,411606,411609,411621,411622,411623,411624,411625,411626,411627,411628,411643,411681',
'[^,]+',
1,
LEVEL,
'i') as 分割后结果
FROM DUAL
CONNECT BY LEVEL <= LENGTHB(TRANSLATE('411600,411602,411603,411606,411609,411621,411622,411623,411624,411625,411626,411627,411628,411643,411681', ',' || '411600,411602,411603,411606,411609,411621,411622,411623,411624,411625,411626,411627,411628,411643,411681', ',')) + 1;
SELECT REGEXP_SUBSTR('411600,411602,411603,411606,411609,411621,411622,411623,411624,411625,411626,411627,411628,411643,411681',
'[^,]+',
1,
LEVEL,
'i') as 分割后结果
FROM DUAL
CONNECT BY LEVEL <= LENGTHB(TRANSLATE('411600,411602,411603,411606,411609,411621,411622,411623,411624,411625,411626,411627,411628,411643,411681',
',' ||
'411600,411602,411603,411606,411609,411621,411622,411623,411624,411625,411626,411627,411628,411643,411681',
',')) + 1;