Mysql：选择两个日期之间的所有数据 [英] Mysql: Select all data between two dates

问题描述

我有一个mysql表与数据连接到日期。每行都有数据和日期，如下所示：

  2009-06-25 75 
 2009-07-01 100 
 2009-07-02 120 
  

我有一个mysql查询，两个日期。这是查询：

SELECT data FROM tbl WHERE date BETWEEN date1 AND date2

我的问题是，即使没有一天的数据，我也需要在date1和date2之间获取行。

所以我的查询会错过2009-06-25和2009-07-01之间的空白日期。

我可以在某些方面将这些日期添加为0作为数据吗？

解决方案

您可以使用经常被称为日历表的概念。 这里是如何创建日历表的好指南在MySql中：

   - 创建一些基础架构
 CREATE TABLE ints（i INTEGER）; 
 INSERT INTO ints VALUES（0），（1），（2），（3），（4），（5），（6），（7），（8），（9） 
 
  - 仅适用于100天，添加更多int连接更多
 SELECT cal.date，tbl.data 
 FROM（
 SELECT'2009-06- 25'+ INTERVAL ai * 10 + bi DAY as date 
 FROM ints a JOIN ints b 
 ORDER BY ai * 10 + bi 
）cal LEFT JOIN tbl ON cal.date = tbl.date 
 WHERE cal.date BETWEEN'2009-06-25'AND'2009-07-01'; 
  

您可能想要创建表 cal 的子选项。

I have a mysql table with data connected to dates. Each row has data and a date, like this:

2009-06-25    75
2009-07-01    100
2009-07-02    120

I have a mysql query that select all data between two dates. This is the query:

SELECT data FROM tbl WHERE date BETWEEN date1 AND date2

My problem is that I also need to get the rows between date1 and date2 even if there is no data for a day.

So my query would miss the dates that are empty between 2009-06-25 and 2009-07-01.

Can I in some way add these dates with just 0 as data?

解决方案

You can use a concept that is frequently referred to as 'calendar tables'. Here is a good guide on how to create calendar tables in MySql:

-- create some infrastructure
CREATE TABLE ints (i INTEGER);
INSERT INTO ints VALUES (0), (1), (2), (3), (4), (5), (6), (7), (8), (9);

-- only works for 100 days, add more ints joins for more
SELECT cal.date, tbl.data
FROM (
    SELECT '2009-06-25' + INTERVAL a.i * 10 + b.i DAY as date
    FROM ints a JOIN ints b
    ORDER BY a.i * 10 + b.i
) cal LEFT JOIN tbl ON cal.date = tbl.date
WHERE cal.date BETWEEN '2009-06-25' AND '2009-07-01';

You might want to create table cal instead of the subselect.

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