MySQL数量和显示范围内的所有日期

Question

我有一个MySQL查询的问题。我有以下表格：

[id] 
[from] DATE (Y-m-d) 
[days] INT 
[...] 

和我有两个PHP变量$start和$end。我想有这样的结果，例如：

$start = 2012-19-03 
$end = 2012-24-03 
$result = array(
[0] => COUNT of rows WHERE '2012-19-03' BETWEEN from AND from + INTERVAL days DAY 
[1] => COUNT of rows WHERE '2012-20-03' BETWEEN from AND from + INTERVAL days DAY 
[2] => COUNT of rows WHERE '2012-21-03' BETWEEN from AND from + INTERVAL days DAY 
[4] => COUNT of rows WHERE '2012-22-03' BETWEEN from AND from + INTERVAL days DAY 
[5] => COUNT of rows WHERE '2012-23-03' BETWEEN from AND from + INTERVAL days DAY 
[6] => COUNT of rows WHERE '2012-24-03' BETWEEN from AND from + INTERVAL days DAY 
} 

直到现在我与每一天的查询这样做在一个while循环，但应该有一个更好的办法。我的问题是GROUP BY，那里的数据不存在的日子。

更详细的例子：

的样本数据：

id, from,  days 
1, 2012-15-03, 2 
2, 2012-15-03, 5 
3, 2012-13-03, 20 
4, 2012-16-03, 1 

期望的结果：

$start = 2012-11-03 
$end = 2012-19-03 
$result = array(
[0] => 0 (ROWS IN DB WHERE '2012-11-03' BETWEEN from AND from+days -- no match in data), 
[1] => 0 (ROWS IN DB WHERE '2012-12-03' BETWEEN from AND from+days -- no match in data), 
[2] => 1 (ROWS IN DB WHERE '2012-13-03' BETWEEN from AND from+days -- id #3 matches), 
[3] => 1 (and so on), 
[4] => 3, 
[5] => 4, 
[6] => 3, 
[7] => 2 
) 

这样的..

兴小时没有找到一种方法，我希望你能帮我， 问候

Answer 1

我不知道你问

，但似乎你可以使用和使用的if/else和group by才达到什么：

象下面这样：

select sum(if('2012-19-03' BETWEEN `from` AND date_Add(`from` , INTERVAL days DAY)),1,0)) as firstdaycount, 
sum(if('2012-20-03' BETWEEN `from` AND date_Add(`from` , INTERVAL days DAY)),1,0)) as secondaycount, 
.. 
.... 
..... 
...... 
..... 
where [...] 
Group By ... 

让我知道如果你需要进一步的帮助。

Answer 2

试试这个：

SELECT `from`, COUNT(*) TotalRows 
FROM tableName 
WHERE `from` <= date('$start') AND `from` >= date('$end') 
GROUP BY `from` 
ORDER BY `from` 

Answer 3

修订的答案：以 “日期列表” 表应该帮助加盟。该表是一个包含日期的列表（例如2000到2050年）。填充此表应该很简单：您可以在Excel中创建数据并将其导入到MySQL中或编写一个（PHP）脚本。让我们称之为表datelist（可以使用this query填充表）：

CREATE TABLE `datelist` (
`date` DATE NOT NULL, 
PRIMARY KEY (`date`) 
); 

至于您的查询，它只是变成了：

SELECT datelist.`date`, COUNT(table1.id) 
FROM datelist 
LEFT JOIN table1 ON datelist.`date` BETWEEN table1.`from` AND (table1.`from` + INTERVAL table1.days DAY) 
WHERE datelist.`date` BETWEEN '2012-03-19' AND '2012-03-24' 
GROUP BY datelist.`date`