sql like语句中的通配符：百分号、下划线和escape

就像我们平时用的*和?，sql的like语句中，使用%和_来代表任意多个字符和一个字符

# %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 '/';

评论

1 楼 gaoyanglovejava 2011-04-20  

很好。学习了。