MySql的like语句中的通配符：百分号、下划线和escape
%代表任意多个字符select * from user where username like '%huxiao';
select * from user where username like 'huxiao%';
select * from user where username like '%huxiao%';
_代表一个字符
select * from user where username like '_';
select * from user where username like 'huxia_';
select * from user where username like 'h_xiao';
如果我就真的要查%或者_，怎么办呢？使用escape，转义字符后面的%或_就不作为通配符了，注意前面没有转义字符的%和_仍然起通配符作用
select username from gg_user where username like '%xiao/_%' escape '/';
select username from gg_user where username like '%xiao/%%' escape '/';
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