Oracle中like查询下划线等特殊字符的处理

ESCAPE Clause Example

You can include the actual characters "%" or "_" in the pattern by using the ESCAPE clause, which identifies the escape character. If the escape character appears in the pattern before the character "%" or "_" then Oracle interprets this character literally in the pattern, rather than as a special pattern matching character.

To search for employees with the pattern 'A_B' in their name:

 
   

  
    
  
    SELECT
  
     last_name
    
  
    FROM
  
     employees
    
  
    WHERE
  
     last_name 
  
    LIKE
  
     
  
    '
  
    %A\_B%
  
    '
  
     
  
    ESCAPE
  
     
  
    '
  
    \
  
    '
  
    ;

 
   

The ESCAPE clause identifies the backslash (\) as the escape character. In the pattern, the escape character precedes the underscore (_). This causes Oracle to interpret the underscore literally, rather than as a special pattern matching character.