Attacking rooks Time Limit: 20000ms, Special Time Limit:50000ms, Memory Limit:65536KB Total submit users: 12, Accepted users: 7 Problem 13028 : No special judgement Problem description Chess inspired problems are a common source of exercises in algor…
1.多行转一行 多行转一行可以通过concat_ws(',',collect_set(col_name)) as col_new的方式实现,可以参考:https://www.cnblogs.com/shujuxiong/p/9564556.html select id , concat_ws(',',collect_set(col_name)) as col_new from table_name group by id ; 2.一行转多行 一行转多行通过把原字段中的多个值拆分并转成多条记录的方…
注意 :|,: 是特殊符号,要用 "\\|", "\\;"来表示. 一行转多行 usertags 里面有很多项,每项之间以逗号分隔 create table tag_count2 as select tag,count(gid) from ( select gid,tag from (select b.gid ,b.usertags from zhangb.gid_tags b group by b.gid,b.usertags) a lateral v…
