oracle 按指定字元拆分字串（split）
阿新 • • 發佈：2022-03-14
1.情景展示
在oracle當中，如何拆分以逗號隔開的字串？（將字串按指定字元拆分成多行資料）
比如：411600,411602,411603,411606,411609,411621,411622,411623,411624,411625,411626,411627,411628,411643,411681。
2.具體分析
oracle當中專門的字串拆分函式，但是，我們可以通過REGEXP_SUBSTR()和CONNECT BY LEVEL來實現。
3.解決方案
語法：
SELECT REGEXP_SUBSTR(string, '[^特定字元]+', 1, LEVEL, 'i') as 分割後結果 FROM DUAL CONNECT BY LEVEL <= 特定字元在字串當中出現的次數 + 1;
進一步優化
SELECT REGEXP_SUBSTR(string,
'[^特定字元]+',
1,
LEVEL,
'i') as 起個別名
FROM DUAL
CONNECT BY LEVEL <= LENGTHB(TRANSLATE(string, '特定字元' || string, '特定字元')) + 1;檢視程式碼
SELECT REGEXP_SUBSTR('411600,411602,411603,411606,411609,411621,411622,411623,411624,411625,411626,411627,411628,411643,411681', '[^,]+', 1, LEVEL, 'i') as 分割後結果 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 分割後結果 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;
寫在最後
哪位大佬如若發現文章存在紕漏之處或需要補充更多內容，歡迎留言！！！