How to escape literal percent sign when NO_BACKSLASH_ESCAPES option is enabled?

问题

My company runs MySQL in NO_BACKSLASH_ESCAPES mode. How can I escape a literal % or _ in a LIKE query in this mode? The standard way is \\%, but that doesn\'t work in this mode.

Example: a column has the following values: 5% off, 50% off. The following query works in standard mode but not in NO_BACKSLASH_ESCAPES mode:

SELECT * FROM mytable
WHERE mycol LIKE \'5\\% off\'

回答1:

you need escape

select * from mytable
where mycol like '5\% off' escape '\';

For a version that works regardless of NO_BACKSLASH_ESCAPES mode, you can use a different character, like pipe:

select * from mytable
where mycol like '5|% off' escape '|';

来源：https://stackoverflow.com/questions/5020130/how-to-escape-literal-percent-sign-when-no-backslash-escapes-option-is-enabled