Mysql计数查询按分组年份和月份水平

Question

我是mysql查询的新手，我仍然坚持获取查询。基本上，我希望日期以水平方式（列）分组为年份和月份（Jan＆＃39; 17，Feb＆＃39; ...），如下图所示。

数据如下图所示：

请帮助创建查询。

Answer 1

你可以进行条件聚合 - 每个login_id一次，然后整体，然后将两个结果联合起来。

Select login_idindex,
  Sum(date_format(visitdate, '%Y%m')  = '201701' ) as jan_17,
  Sum(date_format(visitdate, '%Y%m')  = '201702' ) as feb_17,
  . . .,
  Count(*) as total
From your_table
Where visitdate between ? and ?
Group by login_idindex

Union all

Select null,
  Sum(date_format(visitdate, '%Y%m')  = '201701' ) as jan_17,
  Sum(date_format(visitdate, '%Y%m')  = '201702' ) as feb_17,
  . . .,
  Count(*) as total
From your_table
Where visitdate between ? and ?;

将?替换为实际日期，或者如果您使用所有日期，请删除where子句。