使用查询拆分字符串

Question

我写了一个查询，它分割一个字符串，并使用SUBSTR

显示我想要的值

    SELECT SUBSTR ('imagelocation/r1.jpg', 15)   AS image_location  FROM dual

我得到输出为r1.jpg但我只希望值为r1。请帮忙

Answer 1

select SUBSTR (
         'imagelocation/r1.jpg', 
         INSTR('imagelocation/r1.jpg', '/')+1,
         LENGTH('imagelocation/r1.jpg') - INSTR('imagelocation/r1.jpg', '.') - 1
       ) AS image_location  
FROM dual

<强> SUBSTR Function in Oracle

<强> SQL Fiddle

Answer 2

如果你想要更通用的东西，可以使用regexp_replace。

SELECT 
regexp_replace('imagelocation/r1.jpg','^[^/]*/([^.]+).*$','\1') AS image_location 
FROM dual;

Answer 3

试试这个：

SELECT SUBSTR('imagelocation/r1.jpg',15,2) AS image_location FROM dual