关于Oracle的where条件有特殊符号的处理

关于Oracle的where条件有特殊符号的处理

有这样的一些数据：
 select 'fie_a' as col from dual
 union all
 select 'fie_b' as col from dual
 union all
 select 'fi_a' as col from dual
 union all
 select 'fi_b' as col from dual;
 
我需要从这些数据中查找fi_开头的数据，一般写法是：
 select *
 from (
      select 'fie_a' as col from dual
      union all
      select 'fie_b' as col from dual
      union all
      select 'fi_a' as col from dual
      union all
      select 'fi_b' as col from dual
 ) t
 where t.col like 'fi_%';
 
但这样写并不能得到我们想要的结果，那么我们需要作如下处理：
 
select *
 from (
      select 'fie_a' as col from dual
      union all
      select 'fie_b' as col from dual
      union all
      select 'fi_a' as col from dual
      union all
      select 'fi_b' as col from dual
 ) t
 where t.col like 'fi\_%' escape '\';