计算一系列日期的每周数据

Question

我有一个日期范围，比如2012-12-01和2013-01-09 。 我想获取每周数据的记录数量，它应该是week1开始日期的7天。所以2012-12-01到2012-12-07是第week1等等......

表格如下，

+-ID-+--items---+---dated---+
+----+----------+-----------+
| 1  | 10       |2012-12-01 |
| 2  | 2        |2012-12-02 |
| .  | .        |   .       |
| .  | .        |   .       |
| .  | .        |   .       |
+----+----------+-----------+

初始查询Select count(items),week(date) from item_data

Answer 1

尝试这个 ...

SELECT `id`, `items`, `dated`
FROM `table` 
GROUP BY WEEK(`dated`) 

Answer 2

SELECT SUM(items) AS total_items, CONCAT(dated, ' - ', dated + INTERVAL 6 DAY) AS week
    FROM tablename
    GROUP BY WEEK(dated)
    ORDER BY WEEK(dated);

Answer 3

尝试这个：

SELECT CEILING(DATEDIFF(dated, '2012-12-01')) AS weekNo, SUM(items) AS NoOfItems
FROM table
WHERE dated BETWEEN '2012-12-01' AND '2013-01-09'
GROUP BY weekNo