在mysql中group by week 日统计 月统计

易客CRM之前的版本中有一个报表是按月统计销售情况,最近有个客户想按周统计销售情况。按月统计的Sql语句比较好写,sql语句如下:
SELECT DATE_FORMAT(ec_salesorder.duedate,’%Y-%m’) as m, sum(ec_salesorder.total) as total, count(*) as so_count FROM ec_salesorder GROUP BY m ORDER BY m,也就是把duedate日期以月的形式显示,然后groupby,那么按周如何统计呢?
搜了一下mysql的manual,在这里(http://lists.mysql.com/mysql/2664)找 到一个解决方法,通过mysql的week函数来做,sql语句如下:SELECT WEEK(ec_salesorder.duedate) as m, sum(ec_salesorder.total) as total, count(*) as so_count FROM ec_salesorder GROUP BY m ORDER BY m,这个方法有个缺陷,不能显示年份,仅仅靠一个周数不方便查看统计信息。
继续研究mysql manual,在DATE_FORMAT函数介绍发现2个格式符和周有点关系:
%X Year for the week where Sunday is the first day of the week, numeric, four digits; used with %V
%x Year for the week, where Monday is the first day of the week, numeric, four digits; used with %v
把上面的Sql语句中改成:
SELECT DATE_FORMAT(ec_salesorder.duedate,’%x %v’) as m, sum(ec_salesorder.total) as total, count(*) as so_count FROM ec_salesorder GROUP BY m ORDER BY m
显示的结果如下:
m total so_count
2009 11 10000.00 3
2009 12 44000.00 5
如果周日为一周的第一天,那么sql语句应该为:
SELECT DATE_FORMAT(ec_salesorder.duedate,’%X %V’) as m, sum(ec_salesorder.total) as total, count(*) as so_count FROM ec_salesorder GROUP BY m ORDER BY m
结果应该没错,不出意外,易客CRM下个版本将增加按周统计销售情况的报表



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