sql like语句中的通配符：百分号、上划线和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 '______';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 '/';