MySQL左外连接多次同一个表？

Question

所以我有一个 MySQL 困境似乎相对简单，但事实并非如此。

我有两个表：一个包含要显示的唯一ID列表，另一个表列出时间戳旁边的ID。

======   ============================
| ID |   | ID |      Timestamp      |
======   ============================
| 1  |   | 1  | 2015-10-10 00:00:00 |
| 2  |   | 1  | 2015-10-10 00:10:00 |
| .. |   | 2  | 2015-10-10 00:00:00 |
======   ============================

我需要显示一个布尔值，如果相关的id在两个日期时间之间的表B 中有记录，并且它的所有时间的最后一个日期

我尝试过类似的东西：

SELECT 
    a.`ID`, 
    MAX(b1.`Timestamp`) IS NOT NULL as 'Active',
    MAX(b2.`Timestamp`) AS 'LastActive'
FROM `Table-A` a
LEFT OUTER JOIN `Table-B` b1
    ON a.ID = b1.ID
    AND b1.`Timestamp` BETWEEN @startTime AND @endTime
LEFT OUTER JOIN `Table-B` b2
    ON a.ID = b2.ID
GROUP BY a.ID
;

目前还不确定原因：但查询似乎无限运行而且没有得到任何结果。任何人都可以建议在我的查询中获得所需结果的正确方法吗？

编辑：

以上查询的EXPLAIN SELECT。

Answer 1

使用此

SELECT 
    a.*, 
    IF(b1.cnt IS NULL, FALSE, TRUE) AS is_found, 
    IFNULL(b2.dt, '-') AS max_dt 
FROM table1 a 
    LEFT OUTER JOIN (
        SELECT 
            id, 
            COUNT(*) AS cnt 
        FROM table2 
        WHERE 
            `timestamp` BETWEEN '2015-01-01' AND '2015-12-31' 
        GROUP BY 1) b1 
    ON a.id=b1.id 
    LEFT OUTER JOIN (
        SELECT id, 
            MAX(TIMESTAMP) AS dt 
        FROM table2 
        GROUP BY 1) b2 
    ON a.id=b2.id