You are given an array a of n points in k-dimensional space. Let the distance between two points ax and ay be ∑i=1k|ax,i−ay,i| (it is also known as Manhattan distance). You have to process q queries
最近在处理数据库中数据的时候,写了下面类似的sql语句: UPDATE f_student SET school_id = 0 WHERE id in ( SELECT id FROM f_student WHERE school_id = M ) ) 上面的sql是想数据对某些值进行修改,运行sql后报下面的错误: ? 1 [Err] 1093 – You can't