Oracle中獲取字符串下標、截取字符串

Oracle中獲取字符串下標、截取字符串

 

獲取下標：

SELECT INSTR('AAA-BBB-CCC-DDD', '-', 1, 1) as 字符位置 FROM dual

 

截取字符串：

 

SELECT SUBSTR('AAA-BBB-CCC-DDD', 1, 3) as 截取字符串 FROM DUAL

 

解釋：