类型不同为何可以这样用？

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#1 Created at ... [Delete] [Delete and Lock User]

grade INT NOT NULL

SELECT id, grade, name, gender FROM students WHERE gender=\'M\'

数据库里grade是int型，语句查询的时候用字符 'M'？？？

#2 Created at ... [Delete] [Delete and Lock User]

自己改成数字

#3 Created at ... [Delete] [Delete and Lock User]

哈哈被老师坑了一下。。。

只有自己手动敲，才能体验这种感觉。。。

报个错，后面就长记性了。。。