获取数据，使事件日历

表Users：

user_id  Name 
1   John 
2   Alice 
3   Tom 
4   Charles

表Events：

id   event_id   start_date  end_date  user_id 
1   1    2013-03-02  2013-03-03  1 
2   2    2013-03-02  2013-03-03  3 
3   3    2013-03-04  2013-03-04  1 
4   2    2013-03-10  2013-03-15  2

我已经取得的 “输入” 部分并且不可能在同一天为同一用户提供两个事件（不重叠）。

我提供月份和年份作为变量。

我想有一个MySQL查询，像这样的结果：

user_id 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15  
    1  0 1 1 3 0 0 0 0 0 0 0 0 0 0 0 
    2  0 0 0 0 0 0 0 0 0 2 2 2 2 2 2 
    3  0 2 2 0 0 0 0 0 0 0 0 0 0 0 0

谢谢！

来源

2013-07-16 Mugur Ungureanu

修订

SELECT user_id, 
     COALESCE(MIN(CASE WHEN 1 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `1`, 
     COALESCE(MIN(CASE WHEN 2 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `2`, 
     COALESCE(MIN(CASE WHEN 3 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `3`, 
     COALESCE(MIN(CASE WHEN 4 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `4`, 
     COALESCE(MIN(CASE WHEN 5 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `5`, 
     COALESCE(MIN(CASE WHEN 6 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `6`, 
     COALESCE(MIN(CASE WHEN 7 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `7`, 
     COALESCE(MIN(CASE WHEN 8 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `8`, 
     COALESCE(MIN(CASE WHEN 9 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `9`, 
     COALESCE(MIN(CASE WHEN 10 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `10`, 
     COALESCE(MIN(CASE WHEN 11 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `11`, 
     COALESCE(MIN(CASE WHEN 12 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `12`, 
     COALESCE(MIN(CASE WHEN 13 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `13`, 
     COALESCE(MIN(CASE WHEN 14 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `14`, 
     COALESCE(MIN(CASE WHEN 15 BETWEEN DAY(start_date) AND DAY(end_date) THEN event_id END), 0) `15` 
    FROM 
(
    SELECT id, event_id, 
     CASE WHEN start_date < '2013-03-01' THEN '2013-03-01' ELSE start_date END start_date, 
     CASE WHEN end_date > '2013-03-31' THEN '2013-03-31' ELSE end_date END end_date, 
     user_id 
    FROM events 
    WHERE (start_date >= '2013-03-01' AND end_date <= '2013-03-31') 
     OR (start_date < '2013-03-01' AND end_date > '2013-03-31') 
     OR (start_date < '2013-03-01' AND end_date BETWEEN '2013-03-01' AND '2013-03-31') 
     OR (start_date BETWEEN '2013-03-01' AND '2013-03-31' AND end_date > '2013-03-31') 
) q 
GROUP BY user_id

输出：

 
| USER_ID | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 
----------------------------------------------------------------------------- 
|  1 | 0 | 1 | 1 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
|  2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 2 | 2 | 2 | 2 | 
|  3 | 0 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |

这里是SQLFiddle演示

来源

2013-07-16 07:42:43 peterm

谢谢。这是工作。但是，请问，在2013年3月1日之前开始并于2013年3月31日结束的活动呢？ –

@MugurUngureanu查看更新的答案和sqlfiddle demo – peterm

是的。加工。我的工作。但这只是一个小小的贡献而已。谢谢！祝你今天愉快！！！ –

我tryed这一点：

SELECT user_id, 
    COALESCE(MIN(CASE WHEN '2013-03-01' BETWEEN start_date AND end_date THEN event_id END), 0) `1`, 
    COALESCE(MIN(CASE WHEN '2013-03-02' BETWEEN start_date AND end_date THEN event_id END), 0) `2`, 
    COALESCE(MIN(CASE WHEN '2013-03-03' BETWEEN start_date AND end_date THEN event_id END), 0) `3`, 
    COALESCE(MIN(CASE WHEN '2013-03-04' BETWEEN start_date AND end_date THEN event_id END), 0) `4`, 
    COALESCE(MIN(CASE WHEN '2013-03-05' BETWEEN start_date AND end_date THEN event_id END), 0) `5`, 
    COALESCE(MIN(CASE WHEN '2013-03-06' BETWEEN start_date AND end_date THEN event_id END), 0) `6`, 
    COALESCE(MIN(CASE WHEN '2013-03-07' BETWEEN start_date AND end_date THEN event_id END), 0) `7`, 
    COALESCE(MIN(CASE WHEN '2013-03-08' BETWEEN start_date AND end_date THEN event_id END), 0) `8`, 
    COALESCE(MIN(CASE WHEN '2013-03-09' BETWEEN start_date AND end_date THEN event_id END), 0) `9`, 
    COALESCE(MIN(CASE WHEN '2013-03-10' BETWEEN start_date AND end_date THEN event_id END), 0) `10`, 
    COALESCE(MIN(CASE WHEN '2013-03-11' BETWEEN start_date AND end_date THEN event_id END), 0) `11`, 
    COALESCE(MIN(CASE WHEN '2013-03-12' BETWEEN start_date AND end_date THEN event_id END), 0) `12`, 
    COALESCE(MIN(CASE WHEN '2013-03-13' BETWEEN start_date AND end_date THEN event_id END), 0) `13`, 
    COALESCE(MIN(CASE WHEN '2013-03-14' BETWEEN start_date AND end_date THEN event_id END), 0) `14`, 
    COALESCE(MIN(CASE WHEN '2013-03-15' BETWEEN start_date AND end_date THEN event_id END), 0) `15` 
FROM events 
GROUP BY user_id

来源

2013-07-16 08:25:41

获取数据，使事件日历

回答

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