摘要:
参考 https://www.cnblogs.com/luxd/p/8316243.html https://www.cnblogs.com/s648667069/p/6478559.html 阅读全文
摘要:
参考 https://zhidao.baidu.com/question/2142799026528780468.html select substr('str1234', -4) from dual 阅读全文