mysql比较字符串忽略结尾的空白

今天学习到一个知识点，在查询时如果比较字符串，会忽略结尾的连续空白，起始的空白不会忽略。于是：

select * from users where user='admin ';

会把user='admin'的记录也选出。

这里有比较详细的例子，而且mysql的官方文档也说了：

In particular, trailing spaces are significant, which is not true for CHAR or VARCHAR comparisons performed with the = operator

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