使用count(*)创建动态数据透视表查询mysql
我正在尝试这样的结果集:使用count(*)创建动态数据透视表查询mysql,mysql,sql,report,pivot,Mysql,Sql,Report,Pivot,我正在尝试这样的结果集: chartday username [number of results] 2014-12-12 person3 73 2014-12-12 person2 9 2014-12-12 person4 166 2014-12-12 person1 103 2014-12-12 person5 1 2014-12-12 person6 168 2014-12-13 person2 15 2014-12-13 person7 22 2014-12
chartday username [number of results]
2014-12-12 person3 73
2014-12-12 person2 9
2014-12-12 person4 166
2014-12-12 person1 103
2014-12-12 person5 1
2014-12-12 person6 168
2014-12-13 person2 15
2014-12-13 person7 22
2014-12-13 person1 119
chartday person1 person2 person3 person4 person5 person6 person7
2014-12-12 103 9 73 166 1 168 0
2014-12-13 119 15 0 0 0 0 22
我希望结果如下所示:
chartday username [number of results]
2014-12-12 person3 73
2014-12-12 person2 9
2014-12-12 person4 166
2014-12-12 person1 103
2014-12-12 person5 1
2014-12-12 person6 168
2014-12-13 person2 15
2014-12-13 person7 22
2014-12-13 person1 119
chartday person1 person2 person3 person4 person5 person6 person7
2014-12-12 103 9 73 166 1 168 0
2014-12-13 119 15 0 0 0 0 22
我正在使用mySQL,并且已经为此工作了一段时间,我想了解一些想法。下面是一个我一直在使用的示例:,但我不知道如何添加count*以返回信息。您可以使用条件聚合:
SELECT chartday
,MAX(CASE WHEN username = 'person1' THEN CT ELSE 0 END) AS Person1
,MAX(CASE WHEN username = 'person2' THEN CT ELSE 0 END) AS Person2
,MAX(CASE WHEN username = 'person3' THEN CT ELSE 0 END) AS Person3
,MAX(CASE WHEN username = 'person4' THEN CT ELSE 0 END) AS Person4
,MAX(CASE WHEN username = 'person5' THEN CT ELSE 0 END) AS Person5
,MAX(CASE WHEN username = 'person6' THEN CT ELSE 0 END) AS Person6
,MAX(CASE WHEN username = 'person7' THEN CT ELSE 0 END) AS Person7
FROM Table1
GROUP BY chartday
演示:
要使其动态化,您必须使用准备好的语句:
SET @sql = NULL;
SELECT
GROUP_CONCAT(DISTINCT
CONCAT(
'MAX(IF(username = ''',
username,
''', ct, 0)) AS ',
username
)
) INTO @sql
FROM Table1;
SET @sql = CONCAT('SELECT chartday, ', @sql, ' FROM Table1 GROUP BY chartday');
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
演示:谢谢你提供的信息,这是我最后的选择。我想把它放在动态的地方。这将是highcharts图表的一部分,如果我们提取一份报告,例如2014-12-13,它将只包含第2、7和1个人的结果。将来当我们添加人员时,我不想每次都更新此查询。谢谢,这太完美了。我已经根据您的见解得出了我的答案。我感谢你的帮助!