MySQL怎么将列数据转成行数据
发布时间：2022-01-20 14:15:50 所属栏目：MySql教程 来源：互联网
导读：这篇文章主要介绍MySQL怎么把列数据转成行数据，在日常操作中，相信很多人在MySQL怎么把列数据转成行数据问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答MySQL怎么把列数据转成行数据的疑惑有所帮助！接下来，请跟着小编一
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这篇文章主要介绍“MySQL怎么把列数据转成行数据”，在日常操作中，相信很多人在MySQL怎么把列数据转成行数据问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”MySQL怎么把列数据转成行数据”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！ 开发同学让我帮忙看看一个数据怎么录合适。 原始的数据如下,要录入到数据库里。 insert into target(channel,d,program,starttime,endtime) select '中国之声',1,d1,min(starttime),max(endtime) from ( SELECT @gid := @cgid, @cgid := t.d1, if(@gid = @cgid, @rank,@rank := @rank + 1) AS rank, t.* from (select id,starttime,endtime,d1 from t order by id) t ,(SELECT @gid := 1, @cgid := 1, @rank := 0) t2 ) t4 group by d1,rank union all select '中国之声',2,d2,min(starttime),max(endtime) from ( SELECT @gid := @cgid, @cgid := t.d2, if(@gid = @cgid, @rank,@rank := @rank + 1) AS rank, t.* from (select id,starttime,endtime,d2 from t order by id) t ,(SELECT @gid := 1, @cgid := 1, @rank := 0) t2 ) t4 group by d2,rank union all select '中国之声',3,d3,min(starttime),max(endtime) from ( SELECT @gid := @cgid, @cgid := t.d3, if(@gid = @cgid, @rank,@rank := @rank + 1) AS rank, t.* from (select id,starttime,endtime,d3 from t order by id) t ,(SELECT @gid := 1, @cgid := 1, @rank := 0) t2 ) t4 group by d3,rank union all select '中国之声',4,d4,min(starttime),max(endtime) from ( SELECT @gid := @cgid, @cgid := t.d4, if(@gid = @cgid, @rank,@rank := @rank + 1) AS rank, t.* from (select id,starttime,endtime,d4 from t order by id) t ,(SELECT @gid := 1, @cgid := 1, @rank := 0) t2 ) t4 group by d4,rank union all select '中国之声',5,d5,min(starttime),max(endtime) from ( SELECT @gid := @cgid, @cgid := t.d5, if(@gid = @cgid, @rank,@rank := @rank + 1) AS rank, t.* from (select id,starttime,endtime,d5 from t order by id) t ,(SELECT @gid := 1, @cgid := 1, @rank := 0) t2 ) t4 group by d5,rank union all select '中国之声',6,d6,min(starttime),max(endtime) from ( SELECT @gid := @cgid, @cgid := t.d6, if(@gid = @cgid, @rank,@rank := @rank + 1) AS rank, t.* from (select id,starttime,endtime,d6 from t order by id) t ,(SELECT @gid := 1, @cgid := 1, @rank := 0) t2 ) t4 group by d6,rank union all select '中国之声',7,d7,min(starttime),max(endtime) from ( SELECT @gid := @cgid, @cgid := t.d7, if(@gid = @cgid, @rank,@rank := @rank + 1) AS rank, t.* from (select id,starttime,endtime,d7 from t order by id) t ,(SELECT @gid := 1, @cgid := 1, @rank := 0) t2 ) t4 group by d7,rank; （编辑：丽水站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
