Question

如果我有1000行，我想成为每一行到列，行可以是任何行我是怎么用mysql做的？

Answer 1

以下是工作日按房间预订的MySQL数据透视表查询：

SELECT slot 
  , max(if(day=1, concat(subject,' ',room), '')) as day1 
  , max(if(day=2, concat(subject,' ',room), '')) as day2 
  , max(if(day=3, concat(subject,' ',room), '')) as day3 
  , max(if(day=4, concat(subject,' ',room), '')) as day4 
  , max(if(day=5, concat(subject,' ',room), '')) as day5 
from schedule 
group by slot

MAX（...）在一个条目和一个空白之间决定（如果一个条目存在，该条目将获胜），而该组在同一行上排列所有内容。友好警告：如果同一天和时间存在多个条目，您将只能看到按字母顺序排列的条目＆＃34;更大＆＃34;。

要查看每个广告位每天安排的课程数量（检查冲突），请尝试：

SELECT slot 
  , sum(if(day=1,1,0)) as day1 
  , sum(if(day=2,1,0)) as day2 
  , sum(if(day=3,1,0)) as day3 
  , sum(if(day=4,1,0)) as day4 
  , sum(if(day=5,1,0)) as day5 
from schedule 
group by slot

点击此处查看更多解决方案：MySQL pivot table

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