MySQL:获取日期范围内的所有值(即使是0)
我有一个查询,返回一个日期范围内每天创建的帐户数。看起来是这样的:MySQL:获取日期范围内的所有值(即使是0),mysql,Mysql,我有一个查询,返回一个日期范围内每天创建的帐户数。看起来是这样的: SELECT COUNT(a.id), DATE(a.created_date) AS eventDate FROM accounts a WHERE created_date BETWEEN '2007-1-1' AND '2012-10-10' GROUP BY eventDate 它返回类似于: count || eventDate 1 || 2011-04-27 2 || 2011
SELECT COUNT(a.id), DATE(a.created_date) AS eventDate FROM accounts a WHERE created_date BETWEEN '2007-1-1' AND '2012-10-10' GROUP BY eventDate
它返回类似于:
count || eventDate
1 || 2011-04-27
2 || 2011-04-29
1 || 2011-05-05
4 || 2011-06-09
1 || 2011-08-08
...etc
但是,我希望在未创建帐户的日期获得0,因此结果如下所示:
count || eventDate
1 || 2011-04-27
0 || 2011-04-28
2 || 2011-04-29
0 || 2011-04-30
etc.
我如何使用MySQL查询来实现这一点?您需要有生成完整日期的工具,并对其进行外部连接。这将有所帮助