GROUP BY id 此时查询便会出错,错误提示如下: Column ‘student.score' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause. 出现以上错误的原因是因为一个学生id对应多个分数,如果我们简单的在SELECT语句中写上score,则无法判断应该输出哪一个分...
In2019and2020, user experience professionals from the following companies attendedUX training events. Networking with hundreds of usability enthusiasts from such widely diverse organizations allows you to share with and benefit from a broad experience base. Companies who sent the most attendees: Ableton ...