Oracle : SELECT SUBSTR(\'abcdefg\',2,5) FROM DUAL 结果 bcdefSql Server: SELECT SUBSTRING(\'abcdefg\',2,5) 结果 bcdef 相关文章: 2021-11-30 2021-11-30 2021-11-23 2021-12-10 2021-08-22 2021-11-13 2021-12-10